1387520 has 44 divisors (see below), whose sum is σ = 3340704. Its totient is φ = 552960.

The previous prime is 1387517. The next prime is 1387531. The reversal of 1387520 is 257831.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1387520.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4985 + ... + 5255.

2^1387520 is an apocalyptic number.

1387520 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 1387520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1670352).

1387520 is an abundant number, since it is smaller than the sum of its proper divisors (1953184).

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

1387520 is an equidigital number, since it uses as much as digits as its factorization.

1387520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 278 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1387520 is about 1177.9303884356. The cubic root of 1387520 is about 111.5354911249.

The spelling of 1387520 in words is "one million, three hundred eighty-seven thousand, five hundred twenty".