1992281 has 4 divisors (see below), whose sum is σ = 2109492. Its totient is φ = 1875072.

The previous prime is 1992269. The next prime is 1992299. The reversal of 1992281 is 1822991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1822991 = 1019 ⋅1789.

It can be written as a sum of positive squares in 2 ways, for example, as 737881 + 1254400 = 859^2 + 1120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1992281 is a prime.

It is a super-2 number, since 2×1992281² = 7938367165922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1992241) 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, 58580 + ... + 58613.

It is an arithmetic number, because the mean of its divisors is an integer number (527373).

2^1992281 is an apocalyptic number.

It is an amenable number.

1992281 is a deficient number, since it is larger than the sum of its proper divisors (117211).

1992281 is a wasteful number, since it uses less digits than its factorization.

1992281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117210.

The product of its digits is 2592, while the sum is 32.

The square root of 1992281 is about 1411.4818454376. The cubic root of 1992281 is about 125.8298071709.

The spelling of 1992281 in words is "one million, nine hundred ninety-two thousand, two hundred eighty-one".