1387863239 has 8 divisors (see below), whose sum is σ = 1598619648. Its totient is φ = 1180229400.

The previous prime is 1387863223. The next prime is 1387863299. The reversal of 1387863239 is 9323687831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1387863239 - 2⁴ = 1387863223 is a prime.

It is a super-2 number, since 2×1387863239² = 3852328740335142242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387863299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 779687 + ... + 781464.

It is an arithmetic number, because the mean of its divisors is an integer number (199827456).

Almost surely, 2^1387863239 is an apocalyptic number.

1387863239 is a deficient number, since it is larger than the sum of its proper divisors (210756409).

1387863239 is a wasteful number, since it uses less digits than its factorization.

1387863239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561285.

The product of its digits is 1306368, while the sum is 50.

The square root of 1387863239 is about 37254.0365463932. The cubic root of 1387863239 is about 1115.4468743055.

The spelling of 1387863239 in words is "one billion, three hundred eighty-seven million, eight hundred sixty-three thousand, two hundred thirty-nine".