1639985704 has 48 divisors (see below), whose sum is σ = 3580996500. Its totient is φ = 702067968.

The previous prime is 1639985657. The next prime is 1639985707. The reversal of 1639985704 is 4075899361.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1043160804 + 596824900 = 32298^2 + 24430^2 .

It is not an unprimeable number, because it can be changed into a prime (1639985707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 473772 + ... + 477220.

Almost surely, 2^1639985704 is an apocalyptic number.

1639985704 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1639985704 is an abundant number, since it is smaller than the sum of its proper divisors (1941010796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1639985704 is a wasteful number, since it uses less digits than its factorization.

1639985704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4682 (or 4671 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 1639985704 is about 40496.7369549696. The cubic root of 1639985704 is about 1179.2702813790.

The spelling of 1639985704 in words is "one billion, six hundred thirty-nine million, nine hundred eighty-five thousand, seven hundred four".