11921619 has 8 divisors (see below), whose sum is σ = 16044480. Its totient is φ = 7873256.

The previous prime is 11921593. The next prime is 11921633. The reversal of 11921619 is 91612911.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11921619 - 2⁵ = 11921587 is a prime.

It is a super-2 number, since 2×11921619² = 284249999162322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11921669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18249 + ... + 18890.

It is an arithmetic number, because the mean of its divisors is an integer number (2005560).

Almost surely, 2^11921619 is an apocalyptic number.

11921619 is a deficient number, since it is larger than the sum of its proper divisors (4122861).

11921619 is a wasteful number, since it uses less digits than its factorization.

11921619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37249.

The product of its digits is 972, while the sum is 30.

The square root of 11921619 is about 3452.7697577452. The cubic root of 11921619 is about 228.4432934536.

The spelling of 11921619 in words is "eleven million, nine hundred twenty-one thousand, six hundred nineteen".