1971863 has 4 divisors (see below), whose sum is σ = 1976400. Its totient is φ = 1967328.

The previous prime is 1971857. The next prime is 1971869. The reversal of 1971863 is 3681791.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1971857) and next prime (1971869).

It is a cyclic number.

It is not a de Polignac number, because 1971863 - 2⁶ = 1971799 is a prime.

It is a Duffinian number.

Its product of digits (9072) is a multiple of the sum of its prime divisors (4536).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1971869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1538 + ... + 2511.

It is an arithmetic number, because the mean of its divisors is an integer number (494100).

2^1971863 is an apocalyptic number.

1971863 is a deficient number, since it is larger than the sum of its proper divisors (4537).

1971863 is an equidigital number, since it uses as much as digits as its factorization.

1971863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4536.

The product of its digits is 9072, while the sum is 35.

The square root of 1971863 is about 1404.2303942017. The cubic root of 1971863 is about 125.3984724082.

The spelling of 1971863 in words is "one million, nine hundred seventy-one thousand, eight hundred sixty-three".