23850991 has 4 divisors (see below), whose sum is σ = 23989032. Its totient is φ = 23712952.

The previous prime is 23850979. The next prime is 23851013. The reversal of 23850991 is 19905832.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23850991 - 2¹³ = 23842799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23850991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23850941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68761 + ... + 69106.

It is an arithmetic number, because the mean of its divisors is an integer number (5997258).

Almost surely, 2^23850991 is an apocalyptic number.

23850991 is a deficient number, since it is larger than the sum of its proper divisors (138041).

23850991 is a wasteful number, since it uses less digits than its factorization.

23850991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138040.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 23850991 is about 4883.7476388528. The cubic root of 23850991 is about 287.8517071890.

The spelling of 23850991 in words is "twenty-three million, eight hundred fifty thousand, nine hundred ninety-one".