138315858 has 32 divisors (see below), whose sum is σ = 292386240. Its totient is φ = 43499520.

The previous prime is 138315841. The next prime is 138315869. The reversal of 138315858 is 858513831.

It is a happy number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 26938 + ... + 31658.

It is an arithmetic number, because the mean of its divisors is an integer number (9137070).

Almost surely, 2^138315858 is an apocalyptic number.

138315858 is an abundant number, since it is smaller than the sum of its proper divisors (154070382).

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

138315858 is a wasteful number, since it uses less digits than its factorization.

138315858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5002.

The product of its digits is 115200, while the sum is 42.

The square root of 138315858 is about 11760.7762498910. The cubic root of 138315858 is about 517.1588865000.

The spelling of 138315858 in words is "one hundred thirty-eight million, three hundred fifteen thousand, eight hundred fifty-eight".