22213908 has 18 divisors (see below), whose sum is σ = 56151914. Its totient is φ = 7404624.

The previous prime is 22213903. The next prime is 22213909. The reversal of 22213908 is 80931222.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12404484 + 9809424 = 3522^2 + 3132^2 .

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

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22213903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 308491 + ... + 308562.

Almost surely, 2^22213908 is an apocalyptic number.

It is an amenable number.

22213908 is an abundant number, since it is smaller than the sum of its proper divisors (33938006).

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

22213908 is a wasteful number, since it uses less digits than its factorization.

22213908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617063 (or 617058 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 22213908 is about 4713.1632689734. The cubic root of 22213908 is about 281.1091549605.

The spelling of 22213908 in words is "twenty-two million, two hundred thirteen thousand, nine hundred eight".