1966997 has 4 divisors (see below), whose sum is σ = 2008896. Its totient is φ = 1925100.

The previous prime is 1966973. The next prime is 1966999. The reversal of 1966997 is 7996691.

It is a happy number.

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 not a de Polignac number, because 1966997 - 2⁶ = 1966933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 41851 = 1966997 / (1 + 9 + 6 + 6 + 9 + 9 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966999) 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, 20879 + ... + 20972.

It is an arithmetic number, because the mean of its divisors is an integer number (502224).

2^1966997 is an apocalyptic number.

It is an amenable number.

1966997 is a deficient number, since it is larger than the sum of its proper divisors (41899).

1966997 is an equidigital number, since it uses as much as digits as its factorization.

1966997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41898.

The product of its digits is 183708, while the sum is 47.

The square root of 1966997 is about 1402.4967023134. The cubic root of 1966997 is about 125.2952381266.

The spelling of 1966997 in words is "one million, nine hundred sixty-six thousand, nine hundred ninety-seven".