1917839842 has 16 divisors (see below), whose sum is σ = 2917321560. Its totient is φ = 945487872.

The previous prime is 1917839837. The next prime is 1917839863. The reversal of 1917839842 is 2489387191.

It can be written as a sum of positive squares in 4 ways, for example, as 994834681 + 923005161 = 31541^2 + 30381^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1917839842.

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, 21634 + ... + 65602.

Almost surely, 2^1917839842 is an apocalyptic number.

1917839842 is a deficient number, since it is larger than the sum of its proper divisors (999481718).

1917839842 is a wasteful number, since it uses less digits than its factorization.

1917839842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44277.

The product of its digits is 870912, while the sum is 52.

The square root of 1917839842 is about 43793.1483453748. The cubic root of 1917839842 is about 1242.4267084957.

The spelling of 1917839842 in words is "one billion, nine hundred seventeen million, eight hundred thirty-nine thousand, eight hundred forty-two".