138291476 has 6 divisors (see below), whose sum is σ = 242010090. Its totient is φ = 69145736.

The previous prime is 138291473. The next prime is 138291487. The reversal of 138291476 is 674192831.

It can be written as a sum of positive squares in only one way, i.e., 109411600 + 28879876 = 10460^2 + 5374^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138291473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17286431 + ... + 17286438.

It is an arithmetic number, because the mean of its divisors is an integer number (40335015).

Almost surely, 2^138291476 is an apocalyptic number.

It is an amenable number.

138291476 is a deficient number, since it is larger than the sum of its proper divisors (103718614).

138291476 is a wasteful number, since it uses less digits than its factorization.

138291476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34572873 (or 34572871 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 138291476 is about 11759.7396229678. The cubic root of 138291476 is about 517.1284968563.

The spelling of 138291476 in words is "one hundred thirty-eight million, two hundred ninety-one thousand, four hundred seventy-six".