22986990 has 160 divisors (see below), whose sum is σ = 69521760. Its totient is φ = 5412096.

The previous prime is 22986967. The next prime is 22986991. The reversal of 22986990 is 9968922.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22986991) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 389581 + ... + 389639.

It is an arithmetic number, because the mean of its divisors is an integer number (434511).

Almost surely, 2^22986990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22986990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34760880).

22986990 is an abundant number, since it is smaller than the sum of its proper divisors (46534770).

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

22986990 is a wasteful number, since it uses less digits than its factorization.

22986990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 22986990 is about 4794.4749451843. The cubic root of 22986990 is about 284.3330665537. Note that the first 3 decimals are identical.

The spelling of 22986990 in words is "twenty-two million, nine hundred eighty-six thousand, nine hundred ninety".