249134778 has 48 divisors (see below), whose sum is σ = 573483456. Its totient is φ = 81012960.

The previous prime is 249134773. The next prime is 249134791. The reversal of 249134778 is 877431942.

It is not an unprimeable number, because it can be changed into a prime (249134771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13675 + ... + 26177.

It is an arithmetic number, because the mean of its divisors is an integer number (11947572).

Almost surely, 2^249134778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 249134778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286741728).

249134778 is an abundant number, since it is smaller than the sum of its proper divisors (324348678).

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

249134778 is a wasteful number, since it uses less digits than its factorization.

249134778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12561 (or 12549 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 249134778 is about 15784.0038646726. The cubic root of 249134778 is about 629.2329440016.

The spelling of 249134778 in words is "two hundred forty-nine million, one hundred thirty-four thousand, seven hundred seventy-eight".