1991476862 has 16 divisors (see below), whose sum is σ = 3009918960. Its totient is φ = 988186368.

The previous prime is 1991476847. The next prime is 1991476867. The reversal of 1991476862 is 2686741991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991476867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288293 + ... + 295119.

It is an arithmetic number, because the mean of its divisors is an integer number (188119935).

Almost surely, 2^1991476862 is an apocalyptic number.

1991476862 is a deficient number, since it is larger than the sum of its proper divisors (1018442098).

1991476862 is a wasteful number, since it uses less digits than its factorization.

1991476862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7915.

The product of its digits is 1306368, while the sum is 53.

The square root of 1991476862 is about 44625.9662304358. The cubic root of 1991476862 is about 1258.1287546524.

The spelling of 1991476862 in words is "one billion, nine hundred ninety-one million, four hundred seventy-six thousand, eight hundred sixty-two".