642086395 has 4 divisors (see below), whose sum is σ = 770503680. Its totient is φ = 513669112.

The previous prime is 642086383. The next prime is 642086407. The reversal of 642086395 is 593680246.

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

It is an interprime number because it is at equal distance from previous prime (642086383) and next prime (642086407).

It is a cyclic number.

It is not a de Polignac number, because 642086395 - 2⁷ = 642086267 is a prime.

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, 64208635 + ... + 64208644.

It is an arithmetic number, because the mean of its divisors is an integer number (192625920).

Almost surely, 2^642086395 is an apocalyptic number.

642086395 is a deficient number, since it is larger than the sum of its proper divisors (128417285).

642086395 is a wasteful number, since it uses less digits than its factorization.

642086395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128417284.

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 642086395 is about 25339.4237306218. The cubic root of 642086395 is about 862.7093189368.

The spelling of 642086395 in words is "six hundred forty-two million, eighty-six thousand, three hundred ninety-five".