139000387 has 4 divisors (see below), whose sum is σ = 139035736. Its totient is φ = 138965040.

The previous prime is 139000343. The next prime is 139000391. The reversal of 139000387 is 783000931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139000387 is a prime.

It is a super-2 number, since 2×139000387² = 38642215172299538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139000327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10914 + ... + 19927.

It is an arithmetic number, because the mean of its divisors is an integer number (34758934).

Almost surely, 2^139000387 is an apocalyptic number.

139000387 is a deficient number, since it is larger than the sum of its proper divisors (35349).

139000387 is an equidigital number, since it uses as much as digits as its factorization.

139000387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35348.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 139000387 is about 11789.8425349960. The cubic root of 139000387 is about 518.0106274808.

The spelling of 139000387 in words is "one hundred thirty-nine million, three hundred eighty-seven", and thus it is an aban number.