137878388 has 6 divisors (see below), whose sum is σ = 241287186. Its totient is φ = 68939192.

The previous prime is 137878369. The next prime is 137878393. The reversal of 137878388 is 883878731.

It can be written as a sum of positive squares in only one way, i.e., 130599184 + 7279204 = 11428^2 + 2698^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17234795 + ... + 17234802.

It is an arithmetic number, because the mean of its divisors is an integer number (40214531).

Almost surely, 2^137878388 is an apocalyptic number.

It is an amenable number.

137878388 is a deficient number, since it is larger than the sum of its proper divisors (103408798).

137878388 is a wasteful number, since it uses less digits than its factorization.

137878388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34469601 (or 34469599 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 53.

The square root of 137878388 is about 11742.1628331411. The cubic root of 137878388 is about 516.6130815510.

The spelling of 137878388 in words is "one hundred thirty-seven million, eight hundred seventy-eight thousand, three hundred eighty-eight".