22215990 has 16 divisors (see below), whose sum is σ = 53318448. Its totient is φ = 5924256.

The previous prime is 22215989. The next prime is 22216009. The reversal of 22215990 is 9951222.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 740533 = 22215990 / (2 + 2 + 2 + 1 + 5 + 9 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 370237 + ... + 370296.

It is an arithmetic number, because the mean of its divisors is an integer number (3332403).

Almost surely, 2^22215990 is an apocalyptic number.

22215990 is an abundant number, since it is smaller than the sum of its proper divisors (31102458).

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

22215990 is a wasteful number, since it uses less digits than its factorization.

22215990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 740543.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 22215990 is about 4713.3841345683. The cubic root of 22215990 is about 281.1179370109.

It can be divided in two parts, 222 and 15990, that multiplied together give a triangular number (3549780 = T₂₆₆₄).

The spelling of 22215990 in words is "twenty-two million, two hundred fifteen thousand, nine hundred ninety".