23408890 has 16 divisors (see below), whose sum is σ = 42219432. Its totient is φ = 9345024.

The previous prime is 23408873. The next prime is 23408897. The reversal of 23408890 is 9880432.

It can be written as a sum of positive squares in 4 ways, for example, as 23145721 + 263169 = 4811^2 + 513^2 .

It is a super-4 number, since 4×23408890⁴ (a number of 31 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (23408897) 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 7 ways as a sum of consecutive naturals, for example, 3742 + ... + 7798.

Almost surely, 2^23408890 is an apocalyptic number.

23408890 is a deficient number, since it is larger than the sum of its proper divisors (18810542).

23408890 is a wasteful number, since it uses less digits than its factorization.

23408890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4641.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 23408890 is about 4838.2734523795. The cubic root of 23408890 is about 286.0620678044.

The spelling of 23408890 in words is "twenty-three million, four hundred eight thousand, eight hundred ninety".