639139149 has 24 divisors (see below), whose sum is σ = 1041861600. Its totient is φ = 373998240.

The previous prime is 639139139. The next prime is 639139169. The reversal of 639139149 is 941931936.

639139149 is a `hidden beast` number, since 639 + 1 + 3 + 9 + 1 + 4 + 9 = 666.

639139149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 639139149 - 2⁴ = 639139133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639139129) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108439 + ... + 114180.

It is an arithmetic number, because the mean of its divisors is an integer number (43410900).

Almost surely, 2^639139149 is an apocalyptic number.

It is an amenable number.

639139149 is a deficient number, since it is larger than the sum of its proper divisors (402722451).

639139149 is a wasteful number, since it uses less digits than its factorization.

639139149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222665 (or 222662 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 639139149 is about 25281.2014943910. The cubic root of 639139149 is about 861.3873177984.

The spelling of 639139149 in words is "six hundred thirty-nine million, one hundred thirty-nine thousand, one hundred forty-nine".