23155890 has 16 divisors (see below), whose sum is σ = 55574208. Its totient is φ = 6174896.

The previous prime is 23155879. The next prime is 23155897. The reversal of 23155890 is 9855132.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23155897) 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 7 ways as a sum of consecutive naturals, for example, 385902 + ... + 385961.

It is an arithmetic number, because the mean of its divisors is an integer number (3473388).

Almost surely, 2^23155890 is an apocalyptic number.

23155890 is an abundant number, since it is smaller than the sum of its proper divisors (32418318).

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

23155890 is a wasteful number, since it uses less digits than its factorization.

23155890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771873.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 23155890 is about 4812.0567328326. The cubic root of 23155890 is about 285.0277596845.

The spelling of 23155890 in words is "twenty-three million, one hundred fifty-five thousand, eight hundred ninety".