1890981 has 6 divisors (see below), whose sum is σ = 2731430. Its totient is φ = 1260648.

The previous prime is 1890953. The next prime is 1890997.

1890981 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 1846881 + 44100 = 1359^2 + 210^2 .

It is not a de Polignac number, because 1890981 - 2¹⁰ = 1889957 is a prime.

It is a super-2 number, since 2×1890981² = 7151618284722, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105046 + ... + 105063.

2^1890981 is an apocalyptic number.

It is an amenable number.

1890981 is a deficient number, since it is larger than the sum of its proper divisors (840449).

1890981 is a wasteful number, since it uses less digits than its factorization.

1890981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210115 (or 210112 counting only the distinct ones).

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

The square root of 1890981 is about 1375.1294484520. The cubic root of 1890981 is about 123.6599467275.

The spelling of 1890981 in words is "one million, eight hundred ninety thousand, nine hundred eighty-one".