1890131 has 4 divisors (see below), whose sum is σ = 1892952. Its totient is φ = 1887312.

The previous prime is 1890121. The next prime is 1890149. The reversal of 1890131 is 1310981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1890131 is a prime.

It is a super-2 number, since 2×1890131² = 7145190394322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1890097 and 1890106.

It is not an unprimeable number, because it can be changed into a prime (1890121) 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 3 ways as a sum of consecutive naturals, for example, 236 + ... + 1958.

It is an arithmetic number, because the mean of its divisors is an integer number (473238).

2^1890131 is an apocalyptic number.

1890131 is a deficient number, since it is larger than the sum of its proper divisors (2821).

1890131 is a wasteful number, since it uses less digits than its factorization.

1890131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1890131 is about 1374.8203519006. The cubic root of 1890131 is about 123.6414154805.

The spelling of 1890131 in words is "one million, eight hundred ninety thousand, one hundred thirty-one".