1645132372 has 12 divisors (see below), whose sum is σ = 3100441876. Its totient is φ = 759291840.

The previous prime is 1645132367. The next prime is 1645132373. The reversal of 1645132372 is 2732315461.

It can be written as a sum of positive squares in 2 ways, for example, as 196112016 + 1449020356 = 14004^2 + 38066^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645132373) 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, 15818529 + ... + 15818632.

Almost surely, 2^1645132372 is an apocalyptic number.

It is an amenable number.

1645132372 is a deficient number, since it is larger than the sum of its proper divisors (1455309504).

1645132372 is a wasteful number, since it uses less digits than its factorization.

1645132372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31637178 (or 31637176 counting only the distinct ones).

The product of its digits is 30240, while the sum is 34.

The square root of 1645132372 is about 40560.2314095963. The cubic root of 1645132372 is about 1180.5026040483.

The spelling of 1645132372 in words is "one billion, six hundred forty-five million, one hundred thirty-two thousand, three hundred seventy-two".