1639974692 has 6 divisors (see below), whose sum is σ = 2869955718. Its totient is φ = 819987344.

The previous prime is 1639974689. The next prime is 1639974709. The reversal of 1639974692 is 2964799361.

It can be written as a sum of positive squares in only one way, i.e., 1297872676 + 342102016 = 36026^2 + 18496^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204996833 + ... + 204996840.

It is an arithmetic number, because the mean of its divisors is an integer number (478325953).

Almost surely, 2^1639974692 is an apocalyptic number.

It is an amenable number.

1639974692 is a deficient number, since it is larger than the sum of its proper divisors (1229981026).

1639974692 is a wasteful number, since it uses less digits than its factorization.

1639974692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409993677 (or 409993675 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 56.

The square root of 1639974692 is about 40496.6009931698. The cubic root of 1639974692 is about 1179.2676418940.

The spelling of 1639974692 in words is "one billion, six hundred thirty-nine million, nine hundred seventy-four thousand, six hundred ninety-two".