139305187 has 6 divisors (see below), whose sum is σ = 162048948. Its totient is φ = 119404404.

The previous prime is 139305149. The next prime is 139305197. The reversal of 139305187 is 781503931.

It is a happy number.

It is not a de Polignac number, because 139305187 - 2⁷ = 139305059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139305107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1421433 + ... + 1421530.

It is an arithmetic number, because the mean of its divisors is an integer number (27008158).

Almost surely, 2^139305187 is an apocalyptic number.

139305187 is a deficient number, since it is larger than the sum of its proper divisors (22743761).

139305187 is an equidigital number, since it uses as much as digits as its factorization.

139305187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2842977 (or 2842970 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 139305187 is about 11802.7618378073. The cubic root of 139305187 is about 518.3889822376.

The spelling of 139305187 in words is "one hundred thirty-nine million, three hundred five thousand, one hundred eighty-seven".