139249839 has 16 divisors (see below), whose sum is σ = 197317728. Its totient is φ = 87048192.

The previous prime is 139249837. The next prime is 139249849. The reversal of 139249839 is 938942931.

It is not a de Polignac number, because 139249839 - 2¹ = 139249837 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139249837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9199 + ... + 19055.

It is an arithmetic number, because the mean of its divisors is an integer number (12332358).

Almost surely, 2^139249839 is an apocalyptic number.

139249839 is a deficient number, since it is larger than the sum of its proper divisors (58067889).

139249839 is a wasteful number, since it uses less digits than its factorization.

139249839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10154.

The product of its digits is 419904, while the sum is 48.

The square root of 139249839 is about 11800.4168994150. The cubic root of 139249839 is about 518.3203186204.

The spelling of 139249839 in words is "one hundred thirty-nine million, two hundred forty-nine thousand, eight hundred thirty-nine".