22239690 has 64 divisors (see below), whose sum is σ = 61309440. Its totient is φ = 5106240.

The previous prime is 22239683. The next prime is 22239697. The reversal of 22239690 is 9693222.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (22239683) and next prime (22239697).

It is a super-2 number, since 2×22239690² = 989207622592200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22239697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4497 + ... + 8043.

It is an arithmetic number, because the mean of its divisors is an integer number (957960).

Almost surely, 2^22239690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22239690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30654720).

22239690 is an abundant number, since it is smaller than the sum of its proper divisors (39069750).

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

22239690 is a wasteful number, since it uses less digits than its factorization.

22239690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3587.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 22239690 is about 4715.8975815851. The cubic root of 22239690 is about 281.2178669462.

The spelling of 22239690 in words is "twenty-two million, two hundred thirty-nine thousand, six hundred ninety".