11861645 has 16 divisors (see below), whose sum is σ = 14791728. Its totient is φ = 9123840.

The previous prime is 11861639. The next prime is 11861659. The reversal of 11861645 is 54616811.

It can be written as a sum of positive squares in 8 ways, for example, as 958441 + 10903204 = 979^2 + 3302^2 .

It is not a de Polignac number, because 11861645 - 2⁶ = 11861581 is a prime.

It is a super-3 number, since 3×11861645³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17615 + ... + 18275.

It is an arithmetic number, because the mean of its divisors is an integer number (924483).

Almost surely, 2^11861645 is an apocalyptic number.

It is an amenable number.

11861645 is a deficient number, since it is larger than the sum of its proper divisors (2930083).

11861645 is an equidigital number, since it uses as much as digits as its factorization.

11861645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800.

The product of its digits is 5760, while the sum is 32.

The square root of 11861645 is about 3444.0738958391. The cubic root of 11861645 is about 228.0595732808.

The spelling of 11861645 in words is "eleven million, eight hundred sixty-one thousand, six hundred forty-five".