639425432 has 32 divisors (see below), whose sum is σ = 1218240000. Its totient is φ = 314580000.

The previous prime is 639425431. The next prime is 639425441. The reversal of 639425432 is 234524936.

639425432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×639425432³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639425431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 425819 + ... + 427317.

It is an arithmetic number, because the mean of its divisors is an integer number (38070000).

Almost surely, 2^639425432 is an apocalyptic number.

It is an amenable number.

639425432 is a deficient number, since it is larger than the sum of its proper divisors (578814568).

639425432 is a wasteful number, since it uses less digits than its factorization.

639425432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327 (or 2323 counting only the distinct ones).

The product of its digits is 155520, while the sum is 38.

The square root of 639425432 is about 25286.8628342861. The cubic root of 639425432 is about 861.5159093766.

The spelling of 639425432 in words is "six hundred thirty-nine million, four hundred twenty-five thousand, four hundred thirty-two".