1670997 has 4 divisors (see below), whose sum is σ = 2228000. Its totient is φ = 1113996.

The previous prime is 1670983. The next prime is 1671041. The reversal of 1670997 is 7990761.

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 not a de Polignac number, because 1670997 - 2⁸ = 1670741 is a prime.

It is a D-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 (1670597) 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, 278497 + ... + 278502.

It is an arithmetic number, because the mean of its divisors is an integer number (557000).

2^1670997 is an apocalyptic number.

It is an amenable number.

1670997 is a deficient number, since it is larger than the sum of its proper divisors (557003).

1670997 is an equidigital number, since it uses as much as digits as its factorization.

1670997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557002.

The product of its (nonzero) digits is 23814, while the sum is 39.

The square root of 1670997 is about 1292.6704916567. The cubic root of 1670997 is about 118.6657049046.

The spelling of 1670997 in words is "one million, six hundred seventy thousand, nine hundred ninety-seven".