138611770 has 32 divisors (see below), whose sum is σ = 272750976. Its totient is φ = 50299200.

The previous prime is 138611729. The next prime is 138611771. The reversal of 138611770 is 77116831.

It is not an unprimeable number, because it can be changed into a prime (138611771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68412 + ... + 70408.

It is an arithmetic number, because the mean of its divisors is an integer number (8523468).

Almost surely, 2^138611770 is an apocalyptic number.

138611770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138611770 is a deficient number, since it is larger than the sum of its proper divisors (134139206).

138611770 is a wasteful number, since it uses less digits than its factorization.

138611770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 138611770 is about 11773.3499905507. The cubic root of 138611770 is about 517.5274258688.

The spelling of 138611770 in words is "one hundred thirty-eight million, six hundred eleven thousand, seven hundred seventy".