138641772 has 12 divisors (see below), whose sum is σ = 323497496. Its totient is φ = 46213920.

The previous prime is 138641753. The next prime is 138641773. The reversal of 138641772 is 277146831.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 138641772.

It is not an unprimeable number, because it can be changed into a prime (138641773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5776729 + ... + 5776752.

Almost surely, 2^138641772 is an apocalyptic number.

138641772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138641772 is an abundant number, since it is smaller than the sum of its proper divisors (184855724).

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

138641772 is a wasteful number, since it uses less digits than its factorization.

138641772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11553488 (or 11553486 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 138641772 is about 11774.6240704321. The cubic root of 138641772 is about 517.5647621347.

The spelling of 138641772 in words is "one hundred thirty-eight million, six hundred forty-one thousand, seven hundred seventy-two".