138790554 has 32 divisors (see below), whose sum is σ = 333934080. Its totient is φ = 37567152.

The previous prime is 138790529. The next prime is 138790559. The reversal of 138790554 is 455097831.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (138790559) 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, 86164 + ... + 87759.

It is an arithmetic number, because the mean of its divisors is an integer number (10435440).

Almost surely, 2^138790554 is an apocalyptic number.

138790554 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

138790554 is an abundant number, since it is smaller than the sum of its proper divisors (195143526).

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

138790554 is a wasteful number, since it uses less digits than its factorization.

138790554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173954.

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 138790554 is about 11780.9402850537. The cubic root of 138790554 is about 517.7498357247.

The spelling of 138790554 in words is "one hundred thirty-eight million, seven hundred ninety thousand, five hundred fifty-four".