638439090147 has 12 divisors (see below), whose sum is σ = 932551481160. Its totient is φ = 420843744288.

The previous prime is 638439090119. The next prime is 638439090151. The reversal of 638439090147 is 741090934836.

It is a happy number.

638439090147 is a `hidden beast` number, since 6 + 384 + 39 + 0 + 90 + 147 = 666.

It is not a de Polignac number, because 638439090147 - 2⁸ = 638439089891 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 638439090093 and 638439090102.

It is not an unprimeable number, because it can be changed into a prime (638439090167) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 398525473 + ... + 398527074.

It is an arithmetic number, because the mean of its divisors is an integer number (77712623430).

Almost surely, 2^638439090147 is an apocalyptic number.

638439090147 is a deficient number, since it is larger than the sum of its proper divisors (294112391013).

638439090147 is a wasteful number, since it uses less digits than its factorization.

638439090147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797052642 (or 797052639 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 638439090147 in words is "six hundred thirty-eight billion, four hundred thirty-nine million, ninety thousand, one hundred forty-seven".