1890189 has 32 divisors (see below), whose sum is σ = 3267840. Its totient is φ = 1057536.

The previous prime is 1890173. The next prime is 1890193. The reversal of 1890189 is 9810981.

It is not a de Polignac number, because 1890189 - 2⁴ = 1890173 is a prime.

It is an alternating number because its digits alternate between odd and even.

1890189 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890149) 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 31 ways as a sum of consecutive naturals, for example, 13729 + ... + 13865.

It is an arithmetic number, because the mean of its divisors is an integer number (102120).

2^1890189 is an apocalyptic number.

It is an amenable number.

1890189 is a deficient number, since it is larger than the sum of its proper divisors (1377651).

1890189 is a wasteful number, since it uses less digits than its factorization.

1890189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1890189 is about 1374.8414454038. The cubic root of 1890189 is about 123.6426801422.

The spelling of 1890189 in words is "one million, eight hundred ninety thousand, one hundred eighty-nine".