1607997 has 4 divisors (see below), whose sum is σ = 2144000. Its totient is φ = 1071996.

The previous prime is 1607987. The next prime is 1608007. The reversal of 1607997 is 7997061.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7997061 = 3 ⋅2665687.

It is an interprime number because it is at equal distance from previous prime (1607987) and next prime (1608007).

It is not a de Polignac number, because 1607997 - 2⁴ = 1607981 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 (1607987) 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, 267997 + ... + 268002.

It is an arithmetic number, because the mean of its divisors is an integer number (536000).

2^1607997 is an apocalyptic number.

It is an amenable number.

1607997 is a deficient number, since it is larger than the sum of its proper divisors (536003).

1607997 is an equidigital number, since it uses as much as digits as its factorization.

1607997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536002.

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

The square root of 1607997 is about 1268.0682158307. The cubic root of 1607997 is about 117.1552471952.

The spelling of 1607997 in words is "one million, six hundred seven thousand, nine hundred ninety-seven".