138969488 has 30 divisors (see below), whose sum is σ = 313214886. Its totient is φ = 59558016.

The previous prime is 138969449. The next prime is 138969491. The reversal of 138969488 is 884969831.

It can be written as a sum of positive squares in only one way, i.e., 138956944 + 12544 = 11788^2 + 112^2 .

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87845 + ... + 89412.

Almost surely, 2^138969488 is an apocalyptic number.

It is an amenable number.

138969488 is an abundant number, since it is smaller than the sum of its proper divisors (174245398).

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

138969488 is a wasteful number, since it uses less digits than its factorization.

138969488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177279 (or 177266 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 56.

The square root of 138969488 is about 11788.5320545011. The cubic root of 138969488 is about 517.9722410252.

The spelling of 138969488 in words is "one hundred thirty-eight million, nine hundred sixty-nine thousand, four hundred eighty-eight".