249394993947 has 48 divisors (see below), whose sum is σ = 415492571520. Its totient is φ = 142562246400.

The previous prime is 249394993943. The next prime is 249394993951. The reversal of 249394993947 is 749399493942.

249394993947 is a `hidden beast` number, since 2 + 4 + 93 + 9 + 499 + 3 + 9 + 47 = 666.

It is an interprime number because it is at equal distance from previous prime (249394993943) and next prime (249394993951).

It is not a de Polignac number, because 249394993947 - 2² = 249394993943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (249394993943) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 134947 + ... + 719027.

It is an arithmetic number, because the mean of its divisors is an integer number (8656095240).

Almost surely, 2^249394993947 is an apocalyptic number.

249394993947 is a deficient number, since it is larger than the sum of its proper divisors (166097577573).

249394993947 is a wasteful number, since it uses less digits than its factorization.

249394993947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584344 (or 584341 counting only the distinct ones).

The product of its digits is 476171136, while the sum is 72.

The spelling of 249394993947 in words is "two hundred forty-nine billion, three hundred ninety-four million, nine hundred ninety-three thousand, nine hundred forty-seven".