12191922 has 18 divisors (see below), whose sum is σ = 26447967. Its totient is φ = 4059036.

The previous prime is 12191917. The next prime is 12191947. The reversal of 12191922 is 22919121.

It can be written as a sum of positive squares in only one way, i.e., 6095961 + 6095961 = 2469^2 + 2469^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2469.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14403 + ... + 15225.

Almost surely, 2^12191922 is an apocalyptic number.

12191922 is an abundant number, since it is smaller than the sum of its proper divisors (14256045).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12191922 is an frugal number, since it uses more digits than its factorization.

12191922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1654 (or 828 counting only the distinct ones).

The product of its digits is 648, while the sum is 27.

The square root of 12191922 is about 3491.6932854992. The cubic root of 12191922 is about 230.1569313371.

Multiplying 12191922 by its product of digits (648), we get a square (7900365456 = 88884²).

The spelling of 12191922 in words is "twelve million, one hundred ninety-one thousand, nine hundred twenty-two".