138876858 has 12 divisors (see below), whose sum is σ = 300899898. Its totient is φ = 46292280.

The previous prime is 138876851. The next prime is 138876877. The reversal of 138876858 is 858678831.

It is a happy number.

138876858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 88792929 + 50083929 = 9423^2 + 7077^2 .

It is not an unprimeable number, because it can be changed into a prime (138876851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3857673 + ... + 3857708.

Almost surely, 2^138876858 is an apocalyptic number.

138876858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

138876858 is an abundant number, since it is smaller than the sum of its proper divisors (162023040).

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

138876858 is a wasteful number, since it uses less digits than its factorization.

138876858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7715389 (or 7715386 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 54.

The square root of 138876858 is about 11784.6025813347. The cubic root of 138876858 is about 517.8571307863.

The spelling of 138876858 in words is "one hundred thirty-eight million, eight hundred seventy-six thousand, eight hundred fifty-eight".