23185890 has 192 divisors, whose sum is σ = 78624000. Its totient is φ = 4603392.

The previous prime is 23185859. The next prime is 23185927. The reversal of 23185890 is 9858132.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 155536 + ... + 155684.

It is an arithmetic number, because the mean of its divisors is an integer number (409500).

Almost surely, 2^23185890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23185890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39312000).

23185890 is an abundant number, since it is smaller than the sum of its proper divisors (55438110).

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

23185890 is a wasteful number, since it uses less digits than its factorization.

23185890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 23185890 is about 4815.1728940922. The cubic root of 23185890 is about 285.1507973900.

The spelling of 23185890 in words is "twenty-three million, one hundred eighty-five thousand, eight hundred ninety".