1947399394 has 16 divisors (see below), whose sum is σ = 2997691488. Its totient is φ = 948300192.

The previous prime is 1947399383. The next prime is 1947399401. The reversal of 1947399394 is 4939937491.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2787 + ... + 62470.

It is an arithmetic number, because the mean of its divisors is an integer number (187355718).

Almost surely, 2^1947399394 is an apocalyptic number.

1947399394 is a deficient number, since it is larger than the sum of its proper divisors (1050292094).

1947399394 is a wasteful number, since it uses less digits than its factorization.

1947399394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65649.

The product of its digits is 6613488, while the sum is 58.

The square root of 1947399394 is about 44129.3484429580. The cubic root of 1947399394 is about 1248.7773418622. Note that the first 3 decimals are identical.

The spelling of 1947399394 in words is "one billion, nine hundred forty-seven million, three hundred ninety-nine thousand, three hundred ninety-four".