22399990 has 32 divisors (see below), whose sum is σ = 41713056. Its totient is φ = 8655360.

The previous prime is 22399987. The next prime is 22399991. The reversal of 22399990 is 9999322.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22399991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48360 + ... + 48820.

It is an arithmetic number, because the mean of its divisors is an integer number (1303533).

Almost surely, 2^22399990 is an apocalyptic number.

22399990 is a deficient number, since it is larger than the sum of its proper divisors (19313066).

22399990 is a wasteful number, since it uses less digits than its factorization.

22399990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 22399990 is about 4732.8627700368. The cubic root of 22399990 is about 281.8919073344.

The spelling of 22399990 in words is "twenty-two million, three hundred ninety-nine thousand, nine hundred ninety".