1995997 has 8 divisors (see below), whose sum is σ = 2093312. Its totient is φ = 1902780.

The previous prime is 1995991. The next prime is 1996013. The reversal of 1995997 is 7995991.

It is not a de Polignac number, because 1995997 - 2³ = 1995989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1995997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995991) 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, 29758 + ... + 29824.

It is an arithmetic number, because the mean of its divisors is an integer number (261664).

2^1995997 is an apocalyptic number.

It is an amenable number.

1995997 is a deficient number, since it is larger than the sum of its proper divisors (97315).

1995997 is an frugal number, since it uses more digits than its factorization.

1995997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 98 counting only the distinct ones).

The product of its digits is 229635, while the sum is 49.

The square root of 1995997 is about 1412.7975792731. The cubic root of 1995997 is about 125.9079911138.

It can be divided in two parts, 1995 and 997, that multiplied together give a triangular number (1989015 = T₁₉₉₄).

The spelling of 1995997 in words is "one million, nine hundred ninety-five thousand, nine hundred ninety-seven".