249467978 has 8 divisors (see below), whose sum is σ = 374432772. Its totient is φ = 124657056.

The previous prime is 249467969. The next prime is 249467987. The reversal of 249467978 is 879764942.

It is an interprime number because it is at equal distance from previous prime (249467969) and next prime (249467987).

It can be written as a sum of positive squares in 2 ways, for example, as 246898369 + 2569609 = 15713^2 + 1603^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34325 + ... + 40952.

Almost surely, 2^249467978 is an apocalyptic number.

249467978 is a deficient number, since it is larger than the sum of its proper divisors (124964794).

249467978 is a wasteful number, since it uses less digits than its factorization.

249467978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76936.

The product of its digits is 6096384, while the sum is 56.

The square root of 249467978 is about 15794.5553277071. Note that the first 3 decimals coincide. The cubic root of 249467978 is about 629.5133371010.

The spelling of 249467978 in words is "two hundred forty-nine million, four hundred sixty-seven thousand, nine hundred seventy-eight".