249998820 has 24 divisors (see below), whose sum is σ = 699996864. Its totient is φ = 66666336.

The previous prime is 249998813. The next prime is 249998839. The reversal of 249998820 is 28899942.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2083264 + ... + 2083383.

It is an arithmetic number, because the mean of its divisors is an integer number (29166536).

Almost surely, 2^249998820 is an apocalyptic number.

249998820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249998820 is an abundant number, since it is smaller than the sum of its proper divisors (449998044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

249998820 is a wasteful number, since it uses less digits than its factorization.

249998820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166659 (or 4166657 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 249998820 is about 15811.3509859215. The cubic root of 249998820 is about 629.9595338080.

The spelling of 249998820 in words is "two hundred forty-nine million, nine hundred ninety-eight thousand, eight hundred twenty".