139899385 has 4 divisors (see below), whose sum is σ = 167879268. Its totient is φ = 111919504.

The previous prime is 139899379. The next prime is 139899433. The reversal of 139899385 is 583998931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583998931 = 3557 ⋅164183.

It can be written as a sum of positive squares in 2 ways, for example, as 70610409 + 69288976 = 8403^2 + 8324^2 .

It is a cyclic number.

It is not a de Polignac number, because 139899385 - 2³ = 139899377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13989934 + ... + 13989943.

It is an arithmetic number, because the mean of its divisors is an integer number (41969817).

Almost surely, 2^139899385 is an apocalyptic number.

It is an amenable number.

139899385 is a deficient number, since it is larger than the sum of its proper divisors (27979883).

139899385 is an equidigital number, since it uses as much as digits as its factorization.

139899385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27979882.

The product of its digits is 2099520, while the sum is 55.

The square root of 139899385 is about 11827.9070422455. The cubic root of 139899385 is about 519.1249892327.

The spelling of 139899385 in words is "one hundred thirty-nine million, eight hundred ninety-nine thousand, three hundred eighty-five".