138547988 has 12 divisors (see below), whose sum is σ = 245528640. Its totient is φ = 68396952.

The previous prime is 138547973. The next prime is 138548023. The reversal of 138547988 is 889745831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218906 + ... + 219537.

It is an arithmetic number, because the mean of its divisors is an integer number (20460720).

Almost surely, 2^138547988 is an apocalyptic number.

It is an amenable number.

138547988 is a deficient number, since it is larger than the sum of its proper divisors (106980652).

138547988 is a wasteful number, since it uses less digits than its factorization.

138547988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438526 (or 438524 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 53.

The square root of 138547988 is about 11770.6409341208. The cubic root of 138547988 is about 517.4480338648.

The spelling of 138547988 in words is "one hundred thirty-eight million, five hundred forty-seven thousand, nine hundred eighty-eight".