1890013 has 4 divisors (see below), whose sum is σ = 1908828. Its totient is φ = 1871200.

The previous prime is 1889999. The next prime is 1890019. The reversal of 1890013 is 3100981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1684804 + 205209 = 1298^2 + 453^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890013 - 2⁵ = 1889981 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890019) 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, 9256 + ... + 9457.

It is an arithmetic number, because the mean of its divisors is an integer number (477207).

2^1890013 is an apocalyptic number.

It is an amenable number.

1890013 is a deficient number, since it is larger than the sum of its proper divisors (18815).

1890013 is a wasteful number, since it uses less digits than its factorization.

1890013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18814.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1890013 is about 1374.7774365329. Note that the first 3 decimals coincide. The cubic root of 1890013 is about 123.6388424683.

Adding to 1890013 its reverse (3100981), we get a palindrome (4990994).

The spelling of 1890013 in words is "one million, eight hundred ninety thousand, thirteen".