11765921 has 16 divisors (see below), whose sum is σ = 13320000. Its totient is φ = 10326528.

The previous prime is 11765911. The next prime is 11765927. The reversal of 11765921 is 12956711.

11765921 = 114² + 115² + ... + 332².

It is a cyclic number.

It is not a de Polignac number, because 11765921 - 2¹⁸ = 11503777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11765927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23330 + ... + 23828.

It is an arithmetic number, because the mean of its divisors is an integer number (832500).

Almost surely, 2^11765921 is an apocalyptic number.

It is an amenable number.

11765921 is a deficient number, since it is larger than the sum of its proper divisors (1554079).

11765921 is a wasteful number, since it uses less digits than its factorization.

11765921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608.

The product of its digits is 3780, while the sum is 32.

The square root of 11765921 is about 3430.1488305903. The cubic root of 11765921 is about 227.4444319462. Note that the first 4 decimals are identical.

The spelling of 11765921 in words is "eleven million, seven hundred sixty-five thousand, nine hundred twenty-one".