1640254040 has 48 divisors (see below), whose sum is σ = 3895069680. Its totient is φ = 621564480.

The previous prime is 1640253997. The next prime is 1640254093. The reversal of 1640254040 is 404520461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42356 + ... + 71235.

It is an arithmetic number, because the mean of its divisors is an integer number (81147285).

Almost surely, 2^1640254040 is an apocalyptic number.

1640254040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1640254040 is an abundant number, since it is smaller than the sum of its proper divisors (2254815640).

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

1640254040 is a wasteful number, since it uses less digits than its factorization.

1640254040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113640 (or 113617 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 1640254040 is about 40500.0498765125. The cubic root of 1640254040 is about 1179.3345956415.

The spelling of 1640254040 in words is "one billion, six hundred forty million, two hundred fifty-four thousand, forty".