639932423 has 8 divisors (see below), whose sum is σ = 689488800. Its totient is φ = 590423328.

The previous prime is 639932417. The next prime is 639932429. The reversal of 639932423 is 324239936.

It is an interprime number because it is at equal distance from previous prime (639932417) and next prime (639932429).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 639932423 - 2¹² = 639928327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639932429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19358 + ... + 40676.

It is an arithmetic number, because the mean of its divisors is an integer number (86186100).

Almost surely, 2^639932423 is an apocalyptic number.

639932423 is a deficient number, since it is larger than the sum of its proper divisors (49556377).

639932423 is a wasteful number, since it uses less digits than its factorization.

639932423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23641.

The product of its digits is 209952, while the sum is 41.

The square root of 639932423 is about 25296.8856383548. The cubic root of 639932423 is about 861.7435436466.

The spelling of 639932423 in words is "six hundred thirty-nine million, nine hundred thirty-two thousand, four hundred twenty-three".