249828779 has 4 divisors (see below), whose sum is σ = 251084400. Its totient is φ = 248573160.

The previous prime is 249828769. The next prime is 249828809. The reversal of 249828779 is 977828942.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 249828779 - 2¹⁶ = 249763243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249828769) 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, 627512 + ... + 627909.

It is an arithmetic number, because the mean of its divisors is an integer number (62771100).

Almost surely, 2^249828779 is an apocalyptic number.

249828779 is a deficient number, since it is larger than the sum of its proper divisors (1255621).

249828779 is a wasteful number, since it uses less digits than its factorization.

249828779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1255620.

The product of its digits is 4064256, while the sum is 56.

The square root of 249828779 is about 15805.9728900185. The cubic root of 249828779 is about 629.8166754743.

The spelling of 249828779 in words is "two hundred forty-nine million, eight hundred twenty-eight thousand, seven hundred seventy-nine".