138527864 has 8 divisors (see below), whose sum is σ = 259739760. Its totient is φ = 69263928.

The previous prime is 138527861. The next prime is 138527869. The reversal of 138527864 is 468725831.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138527861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8657984 + ... + 8657999.

It is an arithmetic number, because the mean of its divisors is an integer number (32467470).

Almost surely, 2^138527864 is an apocalyptic number.

It is an amenable number.

138527864 is a deficient number, since it is larger than the sum of its proper divisors (121211896).

138527864 is a wasteful number, since it uses less digits than its factorization.

138527864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17315989 (or 17315985 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The square root of 138527864 is about 11769.7860643259. The cubic root of 138527864 is about 517.4229796614.

The spelling of 138527864 in words is "one hundred thirty-eight million, five hundred twenty-seven thousand, eight hundred sixty-four".