249390642 has 16 divisors (see below), whose sum is σ = 499546080. Its totient is φ = 83002752.

The previous prime is 249390641. The next prime is 249390667. The reversal of 249390642 is 246093942.

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 249390642.

It is not an unprimeable number, because it can be changed into a prime (249390641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27583 + ... + 35490.

It is an arithmetic number, because the mean of its divisors is an integer number (31221630).

Almost surely, 2^249390642 is an apocalyptic number.

249390642 is an abundant number, since it is smaller than the sum of its proper divisors (250155438).

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

249390642 is a wasteful number, since it uses less digits than its factorization.

249390642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63737.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 249390642 is about 15792.1069525254. The cubic root of 249390642 is about 629.4482798868.

The spelling of 249390642 in words is "two hundred forty-nine million, three hundred ninety thousand, six hundred forty-two".