1247819164 has 6 divisors (see below), whose sum is σ = 2183683544. Its totient is φ = 623909580.

The previous prime is 1247819123. The next prime is 1247819171. The reversal of 1247819164 is 4619187421.

It is a self number, because there is not a number n which added to its sum of digits gives 1247819164.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 155977392 + ... + 155977399.

Almost surely, 2^1247819164 is an apocalyptic number.

It is an amenable number.

1247819164 is a deficient number, since it is larger than the sum of its proper divisors (935864380).

1247819164 is a wasteful number, since it uses less digits than its factorization.

1247819164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311954795 (or 311954793 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 1247819164 is about 35324.4839169661. The cubic root of 1247819164 is about 1076.5905178417.

The spelling of 1247819164 in words is "one billion, two hundred forty-seven million, eight hundred nineteen thousand, one hundred sixty-four".