249345478 has 4 divisors (see below), whose sum is σ = 374018220. Its totient is φ = 124672738.

The previous prime is 249345413. The next prime is 249345487. The reversal of 249345478 is 874543942.

It is a happy number.

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

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 as a sum of consecutive naturals, namely, 62336368 + ... + 62336371.

It is an arithmetic number, because the mean of its divisors is an integer number (93504555).

Almost surely, 2^249345478 is an apocalyptic number.

249345478 is a deficient number, since it is larger than the sum of its proper divisors (124672742).

249345478 is a wasteful number, since it uses less digits than its factorization.

249345478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124672741.

The product of its digits is 967680, while the sum is 46.

The square root of 249345478 is about 15790.6769329247. The cubic root of 249345478 is about 629.4102804412.

The spelling of 249345478 in words is "two hundred forty-nine million, three hundred forty-five thousand, four hundred seventy-eight".