139043965 has 16 divisors (see below), whose sum is σ = 171757872. Its totient is φ = 107979264.

The previous prime is 139043953. The next prime is 139043977. The reversal of 139043965 is 569340931.

It is an interprime number because it is at equal distance from previous prime (139043953) and next prime (139043977).

It can be written as a sum of positive squares in 8 ways, for example, as 44448889 + 94595076 = 6667^2 + 9726^2 .

It is a cyclic number.

It is not a de Polignac number, because 139043965 - 2⁹ = 139043453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 158107 + ... + 158983.

It is an arithmetic number, because the mean of its divisors is an integer number (10734867).

Almost surely, 2^139043965 is an apocalyptic number.

It is an amenable number.

139043965 is a deficient number, since it is larger than the sum of its proper divisors (32713907).

139043965 is an equidigital number, since it uses as much as digits as its factorization.

139043965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1776.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 139043965 is about 11791.6905064541. The cubic root of 139043965 is about 518.0647556478.

The spelling of 139043965 in words is "one hundred thirty-nine million, forty-three thousand, nine hundred sixty-five".