639141657 has 32 divisors (see below), whose sum is σ = 1064254464. Its totient is φ = 331464000.

The previous prime is 639141647. The next prime is 639141683. The reversal of 639141657 is 756141936.

It is not a de Polignac number, because 639141657 - 2²³ = 630753049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639141647) 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, 159958 + ... + 163904.

It is an arithmetic number, because the mean of its divisors is an integer number (33257952).

Almost surely, 2^639141657 is an apocalyptic number.

It is an amenable number.

639141657 is a deficient number, since it is larger than the sum of its proper divisors (425112807).

639141657 is a wasteful number, since it uses less digits than its factorization.

639141657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4669.

The product of its digits is 136080, while the sum is 42.

The square root of 639141657 is about 25281.2510964153. The cubic root of 639141657 is about 861.3884444996.

The spelling of 639141657 in words is "six hundred thirty-nine million, one hundred forty-one thousand, six hundred fifty-seven".