1995861 has 16 divisors (see below), whose sum is σ = 3074688. Its totient is φ = 1128000.

The previous prime is 1995857. The next prime is 1995869. The reversal of 1995861 is 1685991.

It is not a de Polignac number, because 1995861 - 2² = 1995857 is a prime.

It is a super-2 number, since 2×1995861² = 7966922262642, which contains 22 as substring.

It is a Curzon number.

1995861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1651 + ... + 2591.

It is an arithmetic number, because the mean of its divisors is an integer number (192168).

2^1995861 is an apocalyptic number.

It is an amenable number.

1995861 is a deficient number, since it is larger than the sum of its proper divisors (1078827).

1995861 is a wasteful number, since it uses less digits than its factorization.

1995861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052.

The product of its digits is 19440, while the sum is 39.

The square root of 1995861 is about 1412.7494470004. The cubic root of 1995861 is about 125.9051314108.

The spelling of 1995861 in words is "one million, nine hundred ninety-five thousand, eight hundred sixty-one".