23121490 has 32 divisors (see below), whose sum is σ = 47931264. Its totient is φ = 7866240.

The previous prime is 23121481. The next prime is 23121491. The reversal of 23121490 is 9412132.

It is not an unprimeable number, because it can be changed into a prime (23121491) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8385 + ... + 10795.

It is an arithmetic number, because the mean of its divisors is an integer number (1497852).

Almost surely, 2^23121490 is an apocalyptic number.

23121490 is an abundant number, since it is smaller than the sum of its proper divisors (24809774).

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

23121490 is a wasteful number, since it uses less digits than its factorization.

23121490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 23121490 is about 4808.4810491464. The cubic root of 23121490 is about 284.8865455873.

The spelling of 23121490 in words is "twenty-three million, one hundred twenty-one thousand, four hundred ninety".