639137142 has 48 divisors (see below), whose sum is σ = 1641249792. Its totient is φ = 182609640.

The previous prime is 639137141. The next prime is 639137159. The reversal of 639137142 is 241731936.

639137142 is a `hidden beast` number, since 639 + 1 + 3 + 7 + 14 + 2 = 666.

639137142 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 639137097 and 639137106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639137141) 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, 90534 + ... + 97337.

It is an arithmetic number, because the mean of its divisors is an integer number (34192704).

Almost surely, 2^639137142 is an apocalyptic number.

639137142 is an abundant number, since it is smaller than the sum of its proper divisors (1002112650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639137142 is a wasteful number, since it uses less digits than its factorization.

639137142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187895 (or 187883 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 639137142 is about 25281.1618008350. The cubic root of 639137142 is about 861.3864161658.

The spelling of 639137142 in words is "six hundred thirty-nine million, one hundred thirty-seven thousand, one hundred forty-two".