1947394999 has 48 divisors (see below), whose sum is σ = 2356816896. Its totient is φ = 1594137600.

The previous prime is 1947394993. The next prime is 1947395011. The reversal of 1947394999 is 9994937491.

It is a happy number.

It is not a de Polignac number, because 1947394999 - 2³ = 1947394991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1947394999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1947394991) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 8732602 + ... + 8732824.

It is an arithmetic number, because the mean of its divisors is an integer number (49100352).

Almost surely, 2^1947394999 is an apocalyptic number.

1947394999 is a deficient number, since it is larger than the sum of its proper divisors (409421897).

1947394999 is a wasteful number, since it uses less digits than its factorization.

1947394999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376 (or 359 counting only the distinct ones).

The product of its digits is 19840464, while the sum is 64.

The square root of 1947394999 is about 44129.2986461376. The cubic root of 1947394999 is about 1248.7764024247.

The spelling of 1947394999 in words is "one billion, nine hundred forty-seven million, three hundred ninety-four thousand, nine hundred ninety-nine".