1992681 has 20 divisors (see below), whose sum is σ = 3026452. Its totient is φ = 1306368.

The previous prime is 1992673. The next prime is 1992691. The reversal of 1992681 is 1862991.

It can be written as a sum of positive squares in 2 ways, for example, as 826281 + 1166400 = 909^2 + 1080^2 .

It is not a de Polignac number, because 1992681 - 2³ = 1992673 is a prime.

It is a super-2 number, since 2×1992681² = 7941555135522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1992611) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5745 + ... + 6081.

2^1992681 is an apocalyptic number.

It is an amenable number.

1992681 is a deficient number, since it is larger than the sum of its proper divisors (1033771).

1992681 is an equidigital number, since it uses as much as digits as its factorization.

1992681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422 (or 413 counting only the distinct ones).

The product of its digits is 7776, while the sum is 36.

The square root of 1992681 is about 1411.6235333828. The cubic root of 1992681 is about 125.8382277626.

The spelling of 1992681 in words is "one million, nine hundred ninety-two thousand, six hundred eighty-one".