249903643 has 16 divisors (see below), whose sum is σ = 283772160. Its totient is φ = 217991200.

The previous prime is 249903629. The next prime is 249903649. The reversal of 249903643 is 346309942.

It is a cyclic number.

It is not a de Polignac number, because 249903643 - 2⁵ = 249903611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249903596 and 249903605.

It is not an unprimeable number, because it can be changed into a prime (249903649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50928 + ... + 55618.

It is an arithmetic number, because the mean of its divisors is an integer number (17735760).

Almost surely, 2^249903643 is an apocalyptic number.

249903643 is a deficient number, since it is larger than the sum of its proper divisors (33868517).

249903643 is a wasteful number, since it uses less digits than its factorization.

249903643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4898.

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 249903643 is about 15808.3409312932. The cubic root of 249903643 is about 629.8795797386.

The spelling of 249903643 in words is "two hundred forty-nine million, nine hundred three thousand, six hundred forty-three".