1902005889 has 16 divisors (see below), whose sum is σ = 2901091200. Its totient is φ = 1085811840.

The previous prime is 1902005879. The next prime is 1902005933. The reversal of 1902005889 is 9885002091.

It is a happy number.

It is not a de Polignac number, because 1902005889 - 2²⁷ = 1767788161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1902005889.

It is not an unprimeable number, because it can be changed into a prime (1902005869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21142 + ... + 65199.

It is an arithmetic number, because the mean of its divisors is an integer number (181318200).

Almost surely, 2^1902005889 is an apocalyptic number.

It is an amenable number.

1902005889 is a deficient number, since it is larger than the sum of its proper divisors (999085311).

1902005889 is a wasteful number, since it uses less digits than its factorization.

1902005889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87400.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 1902005889 is about 43611.9924905983. The cubic root of 1902005889 is about 1238.9980392394.

The spelling of 1902005889 in words is "one billion, nine hundred two million, five thousand, eight hundred eighty-nine".