1916888957 has 4 divisors (see below), whose sum is σ = 1916992896. Its totient is φ = 1916785020.

The previous prime is 1916888927. The next prime is 1916888971. The reversal of 1916888957 is 7598886191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1916888957 - 2¹⁰ = 1916887933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1916888957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916888917) 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 3 ways as a sum of consecutive naturals, for example, 16013 + ... + 63954.

It is an arithmetic number, because the mean of its divisors is an integer number (479248224).

Almost surely, 2^1916888957 is an apocalyptic number.

It is an amenable number.

1916888957 is a deficient number, since it is larger than the sum of its proper divisors (103939).

1916888957 is an equidigital number, since it uses as much as digits as its factorization.

1916888957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103938.

The product of its digits is 8709120, while the sum is 62.

The square root of 1916888957 is about 43782.2904494500. The cubic root of 1916888957 is about 1242.2213385095.

The spelling of 1916888957 in words is "one billion, nine hundred sixteen million, eight hundred eighty-eight thousand, nine hundred fifty-seven".