11979645 has 32 divisors (see below), whose sum is σ = 20528640. Its totient is φ = 5944320.

The previous prime is 11979631. The next prime is 11979647. The reversal of 11979645 is 54697911.

It is not a de Polignac number, because 11979645 - 2¹⁰ = 11978621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11979597 and 11979606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11979647) 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, 27580 + ... + 28010.

It is an arithmetic number, because the mean of its divisors is an integer number (641520).

Almost surely, 2^11979645 is an apocalyptic number.

11979645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11979645 is a deficient number, since it is larger than the sum of its proper divisors (8548995).

11979645 is a wasteful number, since it uses less digits than its factorization.

11979645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565.

The product of its digits is 68040, while the sum is 42.

The square root of 11979645 is about 3461.1623770057. The cubic root of 11979645 is about 228.8133271472.

The spelling of 11979645 in words is "eleven million, nine hundred seventy-nine thousand, six hundred forty-five".