1912173885 has 80 divisors (see below), whose sum is σ = 3613319424. Its totient is φ = 965530368.

The previous prime is 1912173883. The next prime is 1912173919. The reversal of 1912173885 is 5883712191.

It is not a de Polignac number, because 1912173885 - 2¹ = 1912173883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1912173885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1912173883) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 958449 + ... + 960441.

Almost surely, 2^1912173885 is an apocalyptic number.

1912173885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1912173885 is a deficient number, since it is larger than the sum of its proper divisors (1701145539).

1912173885 is a wasteful number, since it uses less digits than its factorization.

1912173885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2127 counting only the distinct ones).

The product of its digits is 120960, while the sum is 45.

The square root of 1912173885 is about 43728.4105016407. The cubic root of 1912173885 is about 1241.2019833380.

The spelling of 1912173885 in words is "one billion, nine hundred twelve million, one hundred seventy-three thousand, eight hundred eighty-five".