642959379 has 12 divisors (see below), whose sum is σ = 929579976. Its totient is φ = 428242272.

The previous prime is 642959357. The next prime is 642959393. The reversal of 642959379 is 973959246.

642959379 is a `hidden beast` number, since 6 + 42 + 9 + 593 + 7 + 9 = 666.

It is not a de Polignac number, because 642959379 - 2⁵ = 642959347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642959309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22689 + ... + 42434.

It is an arithmetic number, because the mean of its divisors is an integer number (77464998).

Almost surely, 2^642959379 is an apocalyptic number.

642959379 is a deficient number, since it is larger than the sum of its proper divisors (286620597).

642959379 is a wasteful number, since it uses less digits than its factorization.

642959379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66226 (or 66223 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 54.

The square root of 642959379 is about 25356.6436856300. The cubic root of 642959379 is about 863.1001232351.

The spelling of 642959379 in words is "six hundred forty-two million, nine hundred fifty-nine thousand, three hundred seventy-nine".