1916897 has 4 divisors (see below), whose sum is σ = 1961520. Its totient is φ = 1872276.

The previous prime is 1916881. The next prime is 1916909. The reversal of 1916897 is 7986191.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7986191 = 37 ⋅215843.

It is a cyclic number.

It is not a de Polignac number, because 1916897 - 2⁴ = 1916881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1916857) 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, 22247 + ... + 22332.

It is an arithmetic number, because the mean of its divisors is an integer number (490380).

2^1916897 is an apocalyptic number.

It is an amenable number.

1916897 is a deficient number, since it is larger than the sum of its proper divisors (44623).

1916897 is an equidigital number, since it uses as much as digits as its factorization.

1916897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44622.

The product of its digits is 27216, while the sum is 41.

The square root of 1916897 is about 1384.5204946118. The cubic root of 1916897 is about 124.2223075903. Note that the first 3 decimals are identical.

The spelling of 1916897 in words is "one million, nine hundred sixteen thousand, eight hundred ninety-seven".