1387857630 has 32 divisors (see below), whose sum is σ = 3336084864. Its totient is φ = 369514656.

The previous prime is 1387857617. The next prime is 1387857643. The reversal of 1387857630 is 367587831.

It is an interprime number because it is at equal distance from previous prime (1387857617) and next prime (1387857643).

It is a super-2 number, since 2×1387857630² = 3852297602298433800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1387857630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16684 + ... + 55263.

It is an arithmetic number, because the mean of its divisors is an integer number (104252652).

Almost surely, 2^1387857630 is an apocalyptic number.

1387857630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1387857630 is an abundant number, since it is smaller than the sum of its proper divisors (1948227234).

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

1387857630 is a wasteful number, since it uses less digits than its factorization.

1387857630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72600.

The product of its (nonzero) digits is 846720, while the sum is 48.

The square root of 1387857630 is about 37253.9612658842. The cubic root of 1387857630 is about 1115.4453716239.

The spelling of 1387857630 in words is "one billion, three hundred eighty-seven million, eight hundred fifty-seven thousand, six hundred thirty".