1645332492 has 12 divisors (see below), whose sum is σ = 3839109176. Its totient is φ = 548444160.

The previous prime is 1645332461. The next prime is 1645332497. The reversal of 1645332492 is 2942335461.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1645332492.

It is not an unprimeable number, because it can be changed into a prime (1645332497) 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, 68555509 + ... + 68555532.

Almost surely, 2^1645332492 is an apocalyptic number.

1645332492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1645332492 is an abundant number, since it is smaller than the sum of its proper divisors (2193776684).

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

1645332492 is a wasteful number, since it uses less digits than its factorization.

1645332492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137111048 (or 137111046 counting only the distinct ones).

The product of its digits is 155520, while the sum is 39.

The square root of 1645332492 is about 40562.6982830285. The cubic root of 1645332492 is about 1180.5504690118.

The spelling of 1645332492 in words is "one billion, six hundred forty-five million, three hundred thirty-two thousand, four hundred ninety-two".