1821967965 has 32 divisors (see below), whose sum is σ = 3253011840. Its totient is φ = 967529088.

The previous prime is 1821967951. The next prime is 1821967981. The reversal of 1821967965 is 5697691281.

It is not a de Polignac number, because 1821967965 - 2¹⁰ = 1821966941 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2494 + ... + 60416.

It is an arithmetic number, because the mean of its divisors is an integer number (101656620).

Almost surely, 2^1821967965 is an apocalyptic number.

1821967965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1821967965 is a deficient number, since it is larger than the sum of its proper divisors (1431043875).

1821967965 is a wasteful number, since it uses less digits than its factorization.

1821967965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58170 (or 58164 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 1821967965 is about 42684.5166893102. The cubic root of 1821967965 is about 1221.3690545682.

The spelling of 1821967965 in words is "one billion, eight hundred twenty-one million, nine hundred sixty-seven thousand, nine hundred sixty-five".