8139938087 has 4 divisors (see below), whose sum is σ = 8141344200. Its totient is φ = 8138531976.

The previous prime is 8139938083. The next prime is 8139938101. The reversal of 8139938087 is 7808399318.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8139938087 - 2² = 8139938083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8139938083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 694337 + ... + 705962.

It is an arithmetic number, because the mean of its divisors is an integer number (2035336050).

Almost surely, 2^8139938087 is an apocalyptic number.

8139938087 is a deficient number, since it is larger than the sum of its proper divisors (1406113).

8139938087 is a wasteful number, since it uses less digits than its factorization.

8139938087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406112.

The product of its (nonzero) digits is 2612736, while the sum is 56.

The square root of 8139938087 is about 90221.6054335102. The cubic root of 8139938087 is about 2011.5941650400.

The spelling of 8139938087 in words is "eight billion, one hundred thirty-nine million, nine hundred thirty-eight thousand, eighty-seven".