1821196986 has 16 divisors (see below), whose sum is σ = 4162736064. Its totient is φ = 520341984.

The previous prime is 1821196963. The next prime is 1821197003. The reversal of 1821196986 is 6896911281.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21680875 + ... + 21680958.

It is an arithmetic number, because the mean of its divisors is an integer number (260171004).

Almost surely, 2^1821196986 is an apocalyptic number.

1821196986 is an abundant number, since it is smaller than the sum of its proper divisors (2341539078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821196986 is a wasteful number, since it uses less digits than its factorization.

1821196986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43361845.

The product of its digits is 373248, while the sum is 51.

The square root of 1821196986 is about 42675.4846018179. The cubic root of 1821196986 is about 1221.1967531952.

The spelling of 1821196986 in words is "one billion, eight hundred twenty-one million, one hundred ninety-six thousand, nine hundred eighty-six".