1995858 has 12 divisors (see below), whose sum is σ = 4324398. Its totient is φ = 665280.

The previous prime is 1995857. The next prime is 1995869. The reversal of 1995858 is 8585991.

It can be written as a sum of positive squares in only one way, i.e., 1595169 + 400689 = 1263^2 + 633^2 .

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1995857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55423 + ... + 55458.

2^1995858 is an apocalyptic number.

1995858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1995858 is an abundant number, since it is smaller than the sum of its proper divisors (2328540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1995858 is a wasteful number, since it uses less digits than its factorization.

1995858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110889 (or 110886 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The square root of 1995858 is about 1412.7483852406. The cubic root of 1995858 is about 125.9050683277.

The spelling of 1995858 in words is "one million, nine hundred ninety-five thousand, eight hundred fifty-eight".