249990321 has 48 divisors (see below), whose sum is σ = 413410176. Its totient is φ = 131172864.

The previous prime is 249990319. The next prime is 249990341. The reversal of 249990321 is 123099942.

It is not a de Polignac number, because 249990321 - 2¹ = 249990319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249990321.

It is not an unprimeable number, because it can be changed into a prime (249990341) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 788455 + ... + 788771.

It is an arithmetic number, because the mean of its divisors is an integer number (8612712).

Almost surely, 2^249990321 is an apocalyptic number.

249990321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

249990321 is a deficient number, since it is larger than the sum of its proper divisors (163419855).

249990321 is a wasteful number, since it uses less digits than its factorization.

249990321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 249990321 is about 15811.0822210246. The cubic root of 249990321 is about 629.9523949920.

The spelling of 249990321 in words is "two hundred forty-nine million, nine hundred ninety thousand, three hundred twenty-one".