249457478 has 16 divisors (see below), whose sum is σ = 397554480. Its totient is φ = 117171936.

The previous prime is 249457459. The next prime is 249457511. The reversal of 249457478 is 874754942.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 55976 + ... + 60267.

It is an arithmetic number, because the mean of its divisors is an integer number (24847155).

Almost surely, 2^249457478 is an apocalyptic number.

249457478 is a deficient number, since it is larger than the sum of its proper divisors (148097002).

249457478 is a wasteful number, since it uses less digits than its factorization.

249457478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116311.

The product of its digits is 2257920, while the sum is 50.

The square root of 249457478 is about 15794.2229311859. Note that the first 3 decimals coincide. The cubic root of 249457478 is about 629.5045049952.

It can be divided in two parts, 24945 and 7478, that added together give a palindrome (32423).

The spelling of 249457478 in words is "two hundred forty-nine million, four hundred fifty-seven thousand, four hundred seventy-eight".