1640339800 has 48 divisors (see below), whose sum is σ = 4160503800. Its totient is φ = 596486400.

The previous prime is 1640339719. The next prime is 1640339803. The reversal of 1640339800 is 89330461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640339803) 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, 370605 + ... + 375004.

Almost surely, 2^1640339800 is an apocalyptic number.

1640339800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640339800 is an abundant number, since it is smaller than the sum of its proper divisors (2520164000).

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

1640339800 is a wasteful number, since it uses less digits than its factorization.

1640339800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745636 (or 745627 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1640339800 is about 40501.1086268018. The cubic root of 1640339800 is about 1179.3551489562.

The spelling of 1640339800 in words is "one billion, six hundred forty million, three hundred thirty-nine thousand, eight hundred".