139487089 has 4 divisors (see below), whose sum is σ = 159413824. Its totient is φ = 119560356.

The previous prime is 139487069. The next prime is 139487123. The reversal of 139487089 is 980784931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 139487089 - 2¹⁵ = 139454321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139487039) 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, 9963357 + ... + 9963370.

It is an arithmetic number, because the mean of its divisors is an integer number (39853456).

Almost surely, 2^139487089 is an apocalyptic number.

It is an amenable number.

139487089 is a deficient number, since it is larger than the sum of its proper divisors (19926735).

139487089 is an equidigital number, since it uses as much as digits as its factorization.

139487089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19926734.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 139487089 is about 11810.4652321575. The cubic root of 139487089 is about 518.6145181781.

The spelling of 139487089 in words is "one hundred thirty-nine million, four hundred eighty-seven thousand, eighty-nine".