19641265 has 32 divisors (see below), whose sum is σ = 28673280. Its totient is φ = 12628224.

The previous prime is 19641263. The next prime is 19641283. The reversal of 19641265 is 56214691.

It is not a de Polignac number, because 19641265 - 2¹ = 19641263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19641265.

It is not an unprimeable number, because it can be changed into a prime (19641263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37294 + ... + 37816.

It is an arithmetic number, because the mean of its divisors is an integer number (896040).

Almost surely, 2^19641265 is an apocalyptic number.

It is an amenable number.

19641265 is a deficient number, since it is larger than the sum of its proper divisors (9032015).

19641265 is a wasteful number, since it uses less digits than its factorization.

19641265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601.

The product of its digits is 12960, while the sum is 34.

The square root of 19641265 is about 4431.8466805611. The cubic root of 19641265 is about 269.8090327732.

The spelling of 19641265 in words is "nineteen million, six hundred forty-one thousand, two hundred sixty-five".