1999897 has 8 divisors (see below), whose sum is σ = 2163456. Its totient is φ = 1841472.

The previous prime is 1999891. The next prime is 1999957. The reversal of 1999897 is 7989991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1999897 - 2³ = 1999889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453 + ... + 2050.

It is an arithmetic number, because the mean of its divisors is an integer number (270432).

2^1999897 is an apocalyptic number.

1999897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1999897 is a deficient number, since it is larger than the sum of its proper divisors (163559).

1999897 is a wasteful number, since it uses less digits than its factorization.

1999897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567.

The product of its digits is 367416, while the sum is 52.

The square root of 1999897 is about 1414.1771459050. The cubic root of 1999897 is about 125.9899420879.

The spelling of 1999897 in words is "one million, nine hundred ninety-nine thousand, eight hundred ninety-seven".