1639396955 has 16 divisors (see below), whose sum is σ = 2380570560. Its totient is φ = 1058030592.

The previous prime is 1639396949. The next prime is 1639396961. The reversal of 1639396955 is 5596939361.

It is an interprime number because it is at equal distance from previous prime (1639396949) and next prime (1639396961).

It is a cyclic number.

It is not a de Polignac number, because 1639396955 - 2⁴ = 1639396939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1639396955.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1377050 + ... + 1378239.

It is an arithmetic number, because the mean of its divisors is an integer number (148785660).

Almost surely, 2^1639396955 is an apocalyptic number.

1639396955 is a deficient number, since it is larger than the sum of its proper divisors (741173605).

1639396955 is a wasteful number, since it uses less digits than its factorization.

1639396955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2755318.

The product of its digits is 5904900, while the sum is 56.

The square root of 1639396955 is about 40489.4672106216. The cubic root of 1639396955 is about 1179.1291465515.

The spelling of 1639396955 in words is "one billion, six hundred thirty-nine million, three hundred ninety-six thousand, nine hundred fifty-five".