138481772 has 24 divisors (see below), whose sum is σ = 284711952. Its totient is φ = 58104000.

The previous prime is 138481771. The next prime is 138481789. The reversal of 138481772 is 277184831.

It is not an unprimeable number, because it can be changed into a prime (138481771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120479 + ... + 121622.

It is an arithmetic number, because the mean of its divisors is an integer number (11862998).

Almost surely, 2^138481772 is an apocalyptic number.

It is an amenable number.

138481772 is an abundant number, since it is smaller than the sum of its proper divisors (146230180).

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

138481772 is a wasteful number, since it uses less digits than its factorization.

138481772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242129 (or 242127 counting only the distinct ones).

The product of its digits is 75264, while the sum is 41.

The square root of 138481772 is about 11767.8278369460. The cubic root of 138481772 is about 517.3655863812.

The spelling of 138481772 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, seven hundred seventy-two".