1899181374 has 16 divisors (see below), whose sum is σ = 3818045712. Its totient is φ = 629779968.

The previous prime is 1899181373. The next prime is 1899181379. The reversal of 1899181374 is 4731819981.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1899181373) 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 7 ways as a sum of consecutive naturals, for example, 818869 + ... + 821184.

It is an arithmetic number, because the mean of its divisors is an integer number (238627857).

Almost surely, 2^1899181374 is an apocalyptic number.

1899181374 is an abundant number, since it is smaller than the sum of its proper divisors (1918864338).

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

1899181374 is a wasteful number, since it uses less digits than its factorization.

1899181374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640251.

The product of its digits is 435456, while the sum is 51.

The square root of 1899181374 is about 43579.5981394964. The cubic root of 1899181374 is about 1238.3844234936.

The spelling of 1899181374 in words is "one billion, eight hundred ninety-nine million, one hundred eighty-one thousand, three hundred seventy-four".