1916997 has 4 divisors (see below), whose sum is σ = 2556000. Its totient is φ = 1277996.

The previous prime is 1916977. The next prime is 1917001. The reversal of 1916997 is 7996191.

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 1916997 - 2⁸ = 1916741 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1916917) 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, 319497 + ... + 319502.

It is an arithmetic number, because the mean of its divisors is an integer number (639000).

2^1916997 is an apocalyptic number.

It is an amenable number.

1916997 is a deficient number, since it is larger than the sum of its proper divisors (639003).

1916997 is an equidigital number, since it uses as much as digits as its factorization.

1916997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639002.

The product of its digits is 30618, while the sum is 42.

The square root of 1916997 is about 1384.5566077268. The cubic root of 1916997 is about 124.2244676811.

The spelling of 1916997 in words is "one million, nine hundred sixteen thousand, nine hundred ninety-seven".