23929290 has 128 divisors (see below), whose sum is σ = 79626240. Its totient is φ = 4968000.

The previous prime is 23929289. The next prime is 23929291. The reversal of 23929290 is 9292932.

It is an interprime number because it is at equal distance from previous prime (23929289) and next prime (23929291).

It is a super-2 number, since 2×23929290² = 1145221839808200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23929291) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20215 + ... + 21365.

It is an arithmetic number, because the mean of its divisors is an integer number (622080).

Almost surely, 2^23929290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23929290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39813120).

23929290 is an abundant number, since it is smaller than the sum of its proper divisors (55696950).

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

23929290 is a wasteful number, since it uses less digits than its factorization.

23929290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185 (or 1179 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 23929290 is about 4891.7573529357. The cubic root of 23929290 is about 288.1663535457.

The spelling of 23929290 in words is "twenty-three million, nine hundred twenty-nine thousand, two hundred ninety".