642454939 has 32 divisors (see below), whose sum is σ = 808980480. Its totient is φ = 497622528.

The previous prime is 642454933. The next prime is 642454979. The reversal of 642454939 is 939454246.

642454939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 642454939 - 2⁵ = 642454907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642454933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 346914 + ... + 348760.

It is an arithmetic number, because the mean of its divisors is an integer number (25280640).

Almost surely, 2^642454939 is an apocalyptic number.

642454939 is a deficient number, since it is larger than the sum of its proper divisors (166525541).

642454939 is a wasteful number, since it uses less digits than its factorization.

642454939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1987.

The product of its digits is 933120, while the sum is 46.

The square root of 642454939 is about 25346.6948338437. The cubic root of 642454939 is about 862.8743463296.

The spelling of 642454939 in words is "six hundred forty-two million, four hundred fifty-four thousand, nine hundred thirty-nine".