138966555 has 32 divisors (see below), whose sum is σ = 273659904. Its totient is φ = 58640256.

The previous prime is 138966539. The next prime is 138966563. The reversal of 138966555 is 555669831.

It is a happy number.

It is not a de Polignac number, because 138966555 - 2⁴ = 138966539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49539 + ... + 52268.

It is an arithmetic number, because the mean of its divisors is an integer number (8551872).

Almost surely, 2^138966555 is an apocalyptic number.

138966555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138966555 is a deficient number, since it is larger than the sum of its proper divisors (134693349).

138966555 is a wasteful number, since it uses less digits than its factorization.

138966555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101835.

The product of its digits is 972000, while the sum is 48.

The square root of 138966555 is about 11788.4076532838. The cubic root of 138966555 is about 517.9685970041.

The spelling of 138966555 in words is "one hundred thirty-eight million, nine hundred sixty-six thousand, five hundred fifty-five".