138732988 has 12 divisors (see below), whose sum is σ = 257064192. Its totient is φ = 65286080.

The previous prime is 138732977. The next prime is 138732991. The reversal of 138732988 is 889237831.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1020028 + ... + 1020163.

It is an arithmetic number, because the mean of its divisors is an integer number (21422016).

Almost surely, 2^138732988 is an apocalyptic number.

It is an amenable number.

138732988 is a deficient number, since it is larger than the sum of its proper divisors (118331204).

138732988 is a wasteful number, since it uses less digits than its factorization.

138732988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040212 (or 2040210 counting only the distinct ones).

The product of its digits is 580608, while the sum is 49.

The square root of 138732988 is about 11778.4968480702. The cubic root of 138732988 is about 517.6782436558.

It can be divided in two parts, 13873 and 2988, that added together give a palindrome (16861).

The spelling of 138732988 in words is "one hundred thirty-eight million, seven hundred thirty-two thousand, nine hundred eighty-eight".