139044487 has 4 divisors (see below), whose sum is σ = 140949280. Its totient is φ = 137139696.

The previous prime is 139044469. The next prime is 139044491. The reversal of 139044487 is 784440931.

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

It is a cyclic number.

It is not a de Polignac number, because 139044487 - 2²³ = 130655879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139044427) 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, 952287 + ... + 952432.

It is an arithmetic number, because the mean of its divisors is an integer number (35237320).

Almost surely, 2^139044487 is an apocalyptic number.

139044487 is a deficient number, since it is larger than the sum of its proper divisors (1904793).

139044487 is an equidigital number, since it uses as much as digits as its factorization.

139044487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904792.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 139044487 is about 11791.7126406642. The cubic root of 139044487 is about 518.0654039547.

The spelling of 139044487 in words is "one hundred thirty-nine million, forty-four thousand, four hundred eighty-seven".