639414401 has 8 divisors (see below), whose sum is σ = 663861504. Its totient is φ = 615206160.

The previous prime is 639414361. The next prime is 639414409. The reversal of 639414401 is 104414936.

It is a happy number.

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

It is not a de Polignac number, because 639414401 - 2⁶ = 639414337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639414409) 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, 54251 + ... + 64976.

It is an arithmetic number, because the mean of its divisors is an integer number (82982688).

Almost surely, 2^639414401 is an apocalyptic number.

It is an amenable number.

639414401 is a deficient number, since it is larger than the sum of its proper divisors (24447103).

639414401 is a wasteful number, since it uses less digits than its factorization.

639414401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119431.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 639414401 is about 25286.6447161342. The cubic root of 639414401 is about 861.5109552224.

The spelling of 639414401 in words is "six hundred thirty-nine million, four hundred fourteen thousand, four hundred one".