12215919 has 8 divisors (see below), whose sum is σ = 16353792. Its totient is φ = 8111000.

The previous prime is 12215899. The next prime is 12215933. The reversal of 12215919 is 91951221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12215919 is a prime.

It is a super-2 number, since 2×12215919² = 298457354029122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215939) 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, 7359 + ... + 8864.

It is an arithmetic number, because the mean of its divisors is an integer number (2044224).

Almost surely, 2^12215919 is an apocalyptic number.

12215919 is a deficient number, since it is larger than the sum of its proper divisors (4137873).

12215919 is a wasteful number, since it uses less digits than its factorization.

12215919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16477.

The product of its digits is 1620, while the sum is 30.

The square root of 12215919 is about 3495.1278946556. The cubic root of 12215919 is about 230.3078360701.

It can be divided in two parts, 1221 and 5919, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 12215919 in words is "twelve million, two hundred fifteen thousand, nine hundred nineteen".