1387639350 has 144 divisors (see below), whose sum is σ = 4070364480. Its totient is φ = 350503200.

The previous prime is 1387639343. The next prime is 1387639361. The reversal of 1387639350 is 539367831.

1387639350 is a `hidden beast` number, since 1 + 3 + 8 + 7 + 639 + 3 + 5 + 0 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 1387639296 and 1387639305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 227845 + ... + 233855.

It is an arithmetic number, because the mean of its divisors is an integer number (28266420).

Almost surely, 2^1387639350 is an apocalyptic number.

1387639350 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387639350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2035182240).

1387639350 is an abundant number, since it is smaller than the sum of its proper divisors (2682725130).

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

1387639350 is a wasteful number, since it uses less digits than its factorization.

1387639350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6057 (or 6040 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The square root of 1387639350 is about 37251.0315293416. The cubic root of 1387639350 is about 1115.3868900774.

The spelling of 1387639350 in words is "one billion, three hundred eighty-seven million, six hundred thirty-nine thousand, three hundred fifty".