642083939 has 16 divisors (see below), whose sum is σ = 766548480. Its totient is φ = 525856320.

The previous prime is 642083921. The next prime is 642083941. The reversal of 642083939 is 939380246.

It is a cyclic number.

It is not a de Polignac number, because 642083939 - 2²⁰ = 641035363 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642083939.

It is not an unprimeable number, because it can be changed into a prime (642083909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211172 + ... + 214190.

It is an arithmetic number, because the mean of its divisors is an integer number (47909280).

Almost surely, 2^642083939 is an apocalyptic number.

642083939 is a deficient number, since it is larger than the sum of its proper divisors (124464541).

642083939 is a wasteful number, since it uses less digits than its factorization.

642083939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 642083939 is about 25339.3752685420. The cubic root of 642083939 is about 862.7082189723.

The spelling of 642083939 in words is "six hundred forty-two million, eighty-three thousand, nine hundred thirty-nine".