1640336972 has 12 divisors (see below), whose sum is σ = 2870874720. Its totient is φ = 820087056.

The previous prime is 1640336969. The next prime is 1640336981. The reversal of 1640336972 is 2796330461.

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, 61853 + ... + 84299.

It is an arithmetic number, because the mean of its divisors is an integer number (239239560).

Almost surely, 2^1640336972 is an apocalyptic number.

It is an amenable number.

1640336972 is a deficient number, since it is larger than the sum of its proper divisors (1230537748).

1640336972 is a wasteful number, since it uses less digits than its factorization.

1640336972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40720 (or 40718 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 41.

The square root of 1640336972 is about 40501.0737141622. The cubic root of 1640336972 is about 1179.3544712067.

The spelling of 1640336972 in words is "one billion, six hundred forty million, three hundred thirty-six thousand, nine hundred seventy-two".