1387847520 has 240 divisors, whose sum is σ = 4934215440. Its totient is φ = 367358976.

The previous prime is 1387847509. The next prime is 1387847551. The reversal of 1387847520 is 257487831.

1387847520 is a `hidden beast` number, since 1 + 3 + 87 + 8 + 47 + 520 = 666.

1387847520 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is a super-2 number, since 2×1387847520² = 3852241477540300800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2241771 + ... + 2242389.

It is an arithmetic number, because the mean of its divisors is an integer number (20559231).

Almost surely, 2^1387847520 is an apocalyptic number.

1387847520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387847520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2467107720).

1387847520 is an abundant number, since it is smaller than the sum of its proper divisors (3546367920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1387847520 is a wasteful number, since it uses less digits than its factorization.

1387847520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 1387847520 is about 37253.8255753688. The cubic root of 1387847520 is about 1115.4426630895.

The spelling of 1387847520 in words is "one billion, three hundred eighty-seven million, eight hundred forty-seven thousand, five hundred twenty".