1995638 has 8 divisors (see below), whose sum is σ = 3008280. Its totient is φ = 992880.

The previous prime is 1995629. The next prime is 1995649. The reversal of 1995638 is 8365991.

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

It is a junction number, because it is equal to n+sod(n) for n = 1995595 and 1995604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1943 + ... + 2786.

It is an arithmetic number, because the mean of its divisors is an integer number (376035).

2^1995638 is an apocalyptic number.

1995638 is a deficient number, since it is larger than the sum of its proper divisors (1012642).

1995638 is a wasteful number, since it uses less digits than its factorization.

1995638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4942.

The product of its digits is 58320, while the sum is 41.

The square root of 1995638 is about 1412.6705206806. The cubic root of 1995638 is about 125.9004420579.

It can be divided in two parts, 1995 and 638, that multiplied together give a triangular number (1272810 = T₁₅₉₅).

The spelling of 1995638 in words is "one million, nine hundred ninety-five thousand, six hundred thirty-eight".