23131290 has 128 divisors (see below), whose sum is σ = 70479360. Its totient is φ = 4727808.

The previous prime is 23131289. The next prime is 23131333. The reversal of 23131290 is 9213132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 100896 + ... + 101124.

It is an arithmetic number, because the mean of its divisors is an integer number (550620).

Almost surely, 2^23131290 is an apocalyptic number.

It is a pronic number, being equal to 4809×4810.

It is a practical number, because each smaller number is the sum of distinct divisors of 23131290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35239680).

23131290 is an abundant number, since it is smaller than the sum of its proper divisors (47348070).

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

23131290 is a wasteful number, since it uses less digits than its factorization.

23131290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 23131290 is about 4809.4999740098. The cubic root of 23131290 is about 284.9267894440.

The spelling of 23131290 in words is "twenty-three million, one hundred thirty-one thousand, two hundred ninety".