22312399 has 4 divisors (see below), whose sum is σ = 22831336. Its totient is φ = 21793464.

The previous prime is 22312393. The next prime is 22312421. The reversal of 22312399 is 99321322.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22312399 - 2⁷ = 22312271 is a prime.

It is a super-3 number, since 3×22312399³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22312399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22312393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259404 + ... + 259489.

It is an arithmetic number, because the mean of its divisors is an integer number (5707834).

Almost surely, 2^22312399 is an apocalyptic number.

22312399 is a deficient number, since it is larger than the sum of its proper divisors (518937).

22312399 is an equidigital number, since it uses as much as digits as its factorization.

22312399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518936.

The product of its digits is 5832, while the sum is 31.

The square root of 22312399 is about 4723.6002159370. The cubic root of 22312399 is about 281.5239987238.

It can be divided in two parts, 22 and 312399, that multiplied together give a triangular number (6872778 = T₃₇₀₇).

The spelling of 22312399 in words is "twenty-two million, three hundred twelve thousand, three hundred ninety-nine".