249492009 has 16 divisors (see below), whose sum is σ = 362275200. Its totient is φ = 151806336.

The previous prime is 249491993. The next prime is 249492043. The reversal of 249492009 is 900294942.

It is not a de Polignac number, because 249492009 - 2⁴ = 249491993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (249492049) 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, 32469 + ... + 39410.

It is an arithmetic number, because the mean of its divisors is an integer number (22642200).

Almost surely, 2^249492009 is an apocalyptic number.

It is an amenable number.

249492009 is a deficient number, since it is larger than the sum of its proper divisors (112783191).

249492009 is a wasteful number, since it uses less digits than its factorization.

249492009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71984.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 249492009 is about 15795.3160462208. The cubic root of 249492009 is about 629.5335499147.

The spelling of 249492009 in words is "two hundred forty-nine million, four hundred ninety-two thousand, nine".