23501990 has 16 divisors (see below), whose sum is σ = 44792352. Its totient is φ = 8847744.

The previous prime is 23501987. The next prime is 23502013. The reversal of 23501990 is 9910532.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68954 + ... + 69293.

It is an arithmetic number, because the mean of its divisors is an integer number (2799522).

Almost surely, 2^23501990 is an apocalyptic number.

23501990 is a deficient number, since it is larger than the sum of its proper divisors (21290362).

23501990 is a wasteful number, since it uses less digits than its factorization.

23501990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138271.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 23501990 is about 4847.8851058993. The cubic root of 23501990 is about 286.4408006930.

The spelling of 23501990 in words is "twenty-three million, five hundred one thousand, nine hundred ninety".