249905623 has 4 divisors (see below), whose sum is σ = 272624328. Its totient is φ = 227186920.

The previous prime is 249905609. The next prime is 249905629. The reversal of 249905623 is 326509942.

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 249905623 - 2⁹ = 249905111 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249905629) 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, 11359336 + ... + 11359357.

It is an arithmetic number, because the mean of its divisors is an integer number (68156082).

Almost surely, 2^249905623 is an apocalyptic number.

249905623 is a deficient number, since it is larger than the sum of its proper divisors (22718705).

249905623 is a wasteful number, since it uses less digits than its factorization.

249905623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22718704.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 249905623 is about 15808.4035563367. The cubic root of 249905623 is about 629.8812432575.

The spelling of 249905623 in words is "two hundred forty-nine million, nine hundred five thousand, six hundred twenty-three".