249945990 has 64 divisors (see below), whose sum is σ = 689126400. Its totient is φ = 56833920.

The previous prime is 249945973. The next prime is 249946003. The reversal of 249945990 is 99549942.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38800 + ... + 44780.

It is an arithmetic number, because the mean of its divisors is an integer number (10767600).

Almost surely, 2^249945990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 249945990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (344563200).

249945990 is an abundant number, since it is smaller than the sum of its proper divisors (439180410).

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

249945990 is a wasteful number, since it uses less digits than its factorization.

249945990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6197.

The product of its (nonzero) digits is 1049760, while the sum is 51.

The square root of 249945990 is about 15809.6802624215. The cubic root of 249945990 is about 629.9151561228.

The spelling of 249945990 in words is "two hundred forty-nine million, nine hundred forty-five thousand, nine hundred ninety".