249999990 has 32 divisors (see below), whose sum is σ = 600480000. Its totient is φ = 66613344.

The previous prime is 249999941. The next prime is 249999991. The reversal of 249999990 is 99999942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249999991) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 47511 + ... + 52509.

It is an arithmetic number, because the mean of its divisors is an integer number (18765000).

Almost surely, 2^249999990 is an apocalyptic number.

249999990 is an abundant number, since it is smaller than the sum of its proper divisors (350480010).

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

249999990 is a wasteful number, since it uses less digits than its factorization.

249999990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6676.

The product of its (nonzero) digits is 4251528, while the sum is 60.

The square root of 249999990 is about 15811.3879846141. The cubic root of 249999990 is about 629.9605165480.

The spelling of 249999990 in words is "two hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety".