1640361252 has 12 divisors (see below), whose sum is σ = 3827509616. Its totient is φ = 546787080.

The previous prime is 1640361157. The next prime is 1640361259. The reversal of 1640361252 is 2521630461.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1640361259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68348374 + ... + 68348397.

Almost surely, 2^1640361252 is an apocalyptic number.

1640361252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1640361252 is an abundant number, since it is smaller than the sum of its proper divisors (2187148364).

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

1640361252 is a wasteful number, since it uses less digits than its factorization.

1640361252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136696778 (or 136696776 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1640361252 is about 40501.3734581927. The cubic root of 1640361252 is about 1179.3602900488.

The spelling of 1640361252 in words is "one billion, six hundred forty million, three hundred sixty-one thousand, two hundred fifty-two".