1812997 has 4 divisors (see below), whose sum is σ = 1829740. Its totient is φ = 1796256.

The previous prime is 1812989. The next prime is 1813001. The reversal of 1812997 is 7992181.

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 729316 + 1083681 = 854^2 + 1041^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812997 - 2³ = 1812989 is a prime.

It is an Ulam 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 (1812907) 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, 8208 + ... + 8425.

It is an arithmetic number, because the mean of its divisors is an integer number (457435).

2^1812997 is an apocalyptic number.

It is an amenable number.

1812997 is a deficient number, since it is larger than the sum of its proper divisors (16743).

1812997 is a wasteful number, since it uses less digits than its factorization.

1812997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16742.

The product of its digits is 9072, while the sum is 37.

The square root of 1812997 is about 1346.4757702982. The cubic root of 1812997 is about 121.9361172313.

It can be divided in two parts, 1812 and 997, that added together give a square (2809 = 53²).

The spelling of 1812997 in words is "one million, eight hundred twelve thousand, nine hundred ninety-seven".