1662997 has 4 divisors (see below), whose sum is σ = 1900576. Its totient is φ = 1425420.

The previous prime is 1662979. The next prime is 1663009. The reversal of 1662997 is 7992661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1662997 is a prime.

It is a Duffinian number.

1662997 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662977) 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, 118779 + ... + 118792.

It is an arithmetic number, because the mean of its divisors is an integer number (475144).

2^1662997 is an apocalyptic number.

It is an amenable number.

1662997 is a deficient number, since it is larger than the sum of its proper divisors (237579).

1662997 is an equidigital number, since it uses as much as digits as its factorization.

1662997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237578.

The product of its digits is 40824, while the sum is 40.

The square root of 1662997 is about 1289.5724097545. The cubic root of 1662997 is about 118.4760287878.

The spelling of 1662997 in words is "one million, six hundred sixty-two thousand, nine hundred ninety-seven".