138497684 has 24 divisors (see below), whose sum is σ = 262933608. Its totient is φ = 63452160.

The previous prime is 138497621. The next prime is 138497687. The reversal of 138497684 is 486794831.

It can be written as a sum of positive squares in 4 ways, for example, as 1373584 + 137124100 = 1172^2 + 11710^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138497687) 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, 2597 + ... + 16844.

It is an arithmetic number, because the mean of its divisors is an integer number (10955567).

Almost surely, 2^138497684 is an apocalyptic number.

It is an amenable number.

138497684 is a deficient number, since it is larger than the sum of its proper divisors (124435924).

138497684 is a wasteful number, since it uses less digits than its factorization.

138497684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19595 (or 19593 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 50.

The square root of 138497684 is about 11768.5038981172. The cubic root of 138497684 is about 517.3854012776.

The spelling of 138497684 in words is "one hundred thirty-eight million, four hundred ninety-seven thousand, six hundred eighty-four".