3646881394 has 32 divisors (see below), whose sum is σ = 6368806080. Its totient is φ = 1551483072.

The previous prime is 3646881383. The next prime is 3646881419. The reversal of 3646881394 is 4931886463.

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, 81484 + ... + 118039.

It is an arithmetic number, because the mean of its divisors is an integer number (199025190).

Almost surely, 2^3646881394 is an apocalyptic number.

3646881394 is a deficient number, since it is larger than the sum of its proper divisors (2721924686).

3646881394 is a wasteful number, since it uses less digits than its factorization.

3646881394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199594.

The product of its digits is 2985984, while the sum is 52.

The square root of 3646881394 is about 60389.4145856706. The cubic root of 3646881394 is about 1539.2430915258.

The spelling of 3646881394 in words is "three billion, six hundred forty-six million, eight hundred eighty-one thousand, three hundred ninety-four".