1971885 has 16 divisors (see below), whose sum is σ = 3223296. Its totient is φ = 1028928.

The previous prime is 1971869. The next prime is 1971887. The reversal of 1971885 is 5881791.

It is not a de Polignac number, because 1971885 - 2⁴ = 1971869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971887) 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, 694 + ... + 2103.

It is an arithmetic number, because the mean of its divisors is an integer number (201456).

2^1971885 is an apocalyptic number.

1971885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1971885 is a deficient number, since it is larger than the sum of its proper divisors (1251411).

1971885 is a wasteful number, since it uses less digits than its factorization.

1971885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2852.

The product of its digits is 20160, while the sum is 39.

The square root of 1971885 is about 1404.2382276523. The cubic root of 1971885 is about 125.3989387618.

The spelling of 1971885 in words is "one million, nine hundred seventy-one thousand, eight hundred eighty-five".