139864 has 8 divisors (see below), whose sum is σ = 262260. Its totient is φ = 69928.

The previous prime is 139861. The next prime is 139871. The reversal of 139864 is 468931.

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

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8734 + ... + 8749.

2¹³⁹⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

139864 is a deficient number, since it is larger than the sum of its proper divisors (122396).

139864 is a wasteful number, since it uses less digits than its factorization.

139864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17489 (or 17485 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 139864 is about 373.9839568752. The cubic root of 139864 is about 51.9081217807.

The spelling of 139864 in words is "one hundred thirty-nine thousand, eight hundred sixty-four".