138494133904 has 45 divisors (see below), whose sum is σ = 312165240291. Its totient is φ = 59350163040.

The previous prime is 138494133901. The next prime is 138494133929. The reversal of 138494133904 is 409331494831.

The square root of 138494133904 is 372148.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138494133901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10413499 + ... + 10426789.

Almost surely, 2^138494133904 is an apocalyptic number.

138494133904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

138494133904 is the 372148-th square number.

It is an amenable number.

138494133904 is an abundant number, since it is smaller than the sum of its proper divisors (173671106387).

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

138494133904 is an frugal number, since it uses more digits than its factorization.

138494133904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26604 (or 13300 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 49.

Multiplying 138494133904 by its sum of digits (49), we get a square (6786212561296 = 2605036²).

138494133904 divided by its sum of digits (49) gives a square (2826410896 = 53164²).

The spelling of 138494133904 in words is "one hundred thirty-eight billion, four hundred ninety-four million, one hundred thirty-three thousand, nine hundred four".