249323643 has 32 divisors (see below), whose sum is σ = 402240000. Its totient is φ = 152028576.

The previous prime is 249323639. The next prime is 249323663. The reversal of 249323643 is 346323942.

249323643 is a `hidden beast` number, since 2 + 4 + 9 + 3 + 2 + 3 + 643 = 666.

It is not a de Polignac number, because 249323643 - 2² = 249323639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 249323598 and 249323607.

It is not an unprimeable number, because it can be changed into a prime (249323663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6498 + ... + 23256.

It is an arithmetic number, because the mean of its divisors is an integer number (12570000).

Almost surely, 2^249323643 is an apocalyptic number.

249323643 is a deficient number, since it is larger than the sum of its proper divisors (152916357).

249323643 is a wasteful number, since it uses less digits than its factorization.

249323643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16816 (or 16810 counting only the distinct ones).

The product of its digits is 93312, while the sum is 36.

The square root of 249323643 is about 15789.9855288091. The cubic root of 249323643 is about 629.3919075732.

The spelling of 249323643 in words is "two hundred forty-nine million, three hundred twenty-three thousand, six hundred forty-three".