1890172156 has 12 divisors (see below), whose sum is σ = 3384727192. Its totient is φ = 923107248.

The previous prime is 1890172147. The next prime is 1890172157. The reversal of 1890172156 is 6512710981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890172157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5494515 + ... + 5494858.

Almost surely, 2^1890172156 is an apocalyptic number.

It is an amenable number.

1890172156 is a deficient number, since it is larger than the sum of its proper divisors (1494555036).

1890172156 is a wasteful number, since it uses less digits than its factorization.

1890172156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10989420 (or 10989418 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 40.

The square root of 1890172156 is about 43476.1101755895. The cubic root of 1890172156 is about 1236.4231286966.

The spelling of 1890172156 in words is "one billion, eight hundred ninety million, one hundred seventy-two thousand, one hundred fifty-six".