138701856 has 24 divisors (see below), whose sum is σ = 364092624. Its totient is φ = 46233920.

The previous prime is 138701851. The next prime is 138701869. The reversal of 138701856 is 658107831.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (138701851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722310 + ... + 722501.

It is an arithmetic number, because the mean of its divisors is an integer number (15170526).

Almost surely, 2^138701856 is an apocalyptic number.

138701856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138701856 is an abundant number, since it is smaller than the sum of its proper divisors (225390768).

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

138701856 is a wasteful number, since it uses less digits than its factorization.

138701856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444824 (or 1444816 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 138701856 is about 11777.1752130976. The cubic root of 138701856 is about 517.6395180315.

The spelling of 138701856 in words is "one hundred thirty-eight million, seven hundred one thousand, eight hundred fifty-six".