1918997 has 4 divisors (see below), whose sum is σ = 1930656. Its totient is φ = 1907340.

The previous prime is 1918991. The next prime is 1919009. The reversal of 1918997 is 7998191.

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: 7998191 = 233 ⋅34327.

It is a cyclic number.

It is not a de Polignac number, because 1918997 - 2⁶ = 1918933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918991) 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, 5579 + ... + 5912.

It is an arithmetic number, because the mean of its divisors is an integer number (482664).

2^1918997 is an apocalyptic number.

It is an amenable number.

1918997 is a deficient number, since it is larger than the sum of its proper divisors (11659).

1918997 is a wasteful number, since it uses less digits than its factorization.

1918997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11658.

The product of its digits is 40824, while the sum is 44.

The square root of 1918997 is about 1385.2786723255. The cubic root of 1918997 is about 124.2676537308.

The spelling of 1918997 in words is "one million, nine hundred eighteen thousand, nine hundred ninety-seven".