1891995 has 32 divisors (see below), whose sum is σ = 3560448. Its totient is φ = 839808.

The previous prime is 1891991. The next prime is 1891997. The reversal of 1891995 is 5991981.

It is not a de Polignac number, because 1891995 - 2² = 1891991 is a prime.

1891995 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1891991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3642 + ... + 4128.

It is an arithmetic number, because the mean of its divisors is an integer number (111264).

2^1891995 is an apocalyptic number.

1891995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1891995 is a deficient number, since it is larger than the sum of its proper divisors (1668453).

1891995 is a wasteful number, since it uses less digits than its factorization.

1891995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539.

The product of its digits is 29160, while the sum is 42.

The square root of 1891995 is about 1375.4980916017. The cubic root of 1891995 is about 123.6820461527.

The spelling of 1891995 in words is "one million, eight hundred ninety-one thousand, nine hundred ninety-five".