249989818 has 8 divisors (see below), whose sum is σ = 403829748. Its totient is φ = 115379904.

The previous prime is 249989767. The next prime is 249989819. The reversal of 249989818 is 818989942.

It can be written as a sum of positive squares in 2 ways, for example, as 239537529 + 10452289 = 15477^2 + 3233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (249989819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4807471 + ... + 4807522.

Almost surely, 2^249989818 is an apocalyptic number.

249989818 is a deficient number, since it is larger than the sum of its proper divisors (153839930).

249989818 is a wasteful number, since it uses less digits than its factorization.

249989818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9615008.

The product of its digits is 2985984, while the sum is 58.

The square root of 249989818 is about 15811.0663144520. The cubic root of 249989818 is about 629.9519724872.

The spelling of 249989818 in words is "two hundred forty-nine million, nine hundred eighty-nine thousand, eight hundred eighteen".