1640831984 has 40 divisors (see below), whose sum is σ = 3580008960. Its totient is φ = 721771200.

The previous prime is 1640831917. The next prime is 1640831989. The reversal of 1640831984 is 4891380461.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640831989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144914 + ... + 155825.

It is an arithmetic number, because the mean of its divisors is an integer number (89500224).

Almost surely, 2^1640831984 is an apocalyptic number.

It is an amenable number.

1640831984 is an abundant number, since it is smaller than the sum of its proper divisors (1939176976).

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

1640831984 is a wasteful number, since it uses less digits than its factorization.

1640831984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300789 (or 300783 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 1640831984 is about 40507.1843504334. The cubic root of 1640831984 is about 1179.4730923418.

The spelling of 1640831984 in words is "one billion, six hundred forty million, eight hundred thirty-one thousand, nine hundred eighty-four".