1971868 has 6 divisors (see below), whose sum is σ = 3450776. Its totient is φ = 985932.

The previous prime is 1971857. The next prime is 1971869. The reversal of 1971868 is 8681791.

It is a self number, because there is not a number n which added to its sum of digits gives 1971868.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246480 + ... + 246487.

2^1971868 is an apocalyptic number.

It is an amenable number.

1971868 is a deficient number, since it is larger than the sum of its proper divisors (1478908).

1971868 is a wasteful number, since it uses less digits than its factorization.

1971868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492971 (or 492969 counting only the distinct ones).

The product of its digits is 24192, while the sum is 40.

The square root of 1971868 is about 1404.2321745353. The cubic root of 1971868 is about 125.3985783979.

The spelling of 1971868 in words is "one million, nine hundred seventy-one thousand, eight hundred sixty-eight".