22390402 has 8 divisors (see below), whose sum is σ = 34493436. Its totient is φ = 10892592.

The previous prime is 22390391. The next prime is 22390427. The reversal of 22390402 is 20409322.

It can be written as a sum of positive squares in 2 ways, for example, as 16966161 + 5424241 = 4119^2 + 2329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151213 + ... + 151360.

Almost surely, 2^22390402 is an apocalyptic number.

22390402 is a deficient number, since it is larger than the sum of its proper divisors (12103034).

22390402 is a wasteful number, since it uses less digits than its factorization.

22390402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302612.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 22390402 is about 4731.8497440219. The cubic root of 22390402 is about 281.8516816419.

Adding to 22390402 its reverse (20409322), we get a palindrome (42799724).

The spelling of 22390402 in words is "twenty-two million, three hundred ninety thousand, four hundred two".