23531490 has 48 divisors (see below), whose sum is σ = 62494848. Its totient is φ = 6140448.

The previous prime is 23531489. The next prime is 23531491. The reversal of 23531490 is 9413532.

It is an interprime number because it is at equal distance from previous prime (23531489) and next prime (23531491).

It is not an unprimeable number, because it can be changed into a prime (23531491) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1449 + ... + 7011.

It is an arithmetic number, because the mean of its divisors is an integer number (1301976).

Almost surely, 2^23531490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23531490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31247424).

23531490 is an abundant number, since it is smaller than the sum of its proper divisors (38963358).

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

23531490 is a wasteful number, since it uses less digits than its factorization.

23531490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5623 (or 5620 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 23531490 is about 4850.9267155874. The cubic root of 23531490 is about 286.5605986415.

The spelling of 23531490 in words is "twenty-three million, five hundred thirty-one thousand, four hundred ninety".