23181890 has 8 divisors (see below), whose sum is σ = 41727420. Its totient is φ = 9272752.

The previous prime is 23181889. The next prime is 23181911. The reversal of 23181890 is 9818132.

It can be written as a sum of positive squares in 2 ways, for example, as 21911761 + 1270129 = 4681^2 + 1127^2 .

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, 1159085 + ... + 1159104.

Almost surely, 2^23181890 is an apocalyptic number.

23181890 is a deficient number, since it is larger than the sum of its proper divisors (18545530).

23181890 is a wasteful number, since it uses less digits than its factorization.

23181890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318196.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 23181890 is about 4814.7575224512. The cubic root of 23181890 is about 285.1343984970.

The spelling of 23181890 in words is "twenty-three million, one hundred eighty-one thousand, eight hundred ninety".