1917940368 has 20 divisors (see below), whose sum is σ = 4954679408. Its totient is φ = 639313440.

The previous prime is 1917940363. The next prime is 1917940373. The reversal of 1917940368 is 8630497191.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1917940363) and next prime (1917940373).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 39957091 = 1917940368 / (1 + 9 + 1 + 7 + 9 + 4 + 0 + 3 + 6 + 8).

It is not an unprimeable number, because it can be changed into a prime (1917940363) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 19978498 + ... + 19978593.

Almost surely, 2^1917940368 is an apocalyptic number.

It is an amenable number.

1917940368 is an abundant number, since it is smaller than the sum of its proper divisors (3036739040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1917940368 is a wasteful number, since it uses less digits than its factorization.

1917940368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39957102 (or 39957096 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 1917940368 is about 43794.2960669537. The cubic root of 1917940368 is about 1242.4484159053.

The spelling of 1917940368 in words is "one billion, nine hundred seventeen million, nine hundred forty thousand, three hundred sixty-eight".