1821986160 has 40 divisors (see below), whose sum is σ = 5648157840. Its totient is φ = 485862912.

The previous prime is 1821986137. The next prime is 1821986183. The reversal of 1821986160 is 616891281.

It is an interprime number because it is at equal distance from previous prime (1821986137) and next prime (1821986183).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 3795565 + ... + 3796044.

It is an arithmetic number, because the mean of its divisors is an integer number (141203946).

Almost surely, 2^1821986160 is an apocalyptic number.

1821986160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1821986160 is an abundant number, since it is smaller than the sum of its proper divisors (3826171680).

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

1821986160 is a wasteful number, since it uses less digits than its factorization.

1821986160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7591625 (or 7591619 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 1821986160 is about 42684.7298222678. The cubic root of 1821986160 is about 1221.3731202701.

The spelling of 1821986160 in words is "one billion, eight hundred twenty-one million, nine hundred eighty-six thousand, one hundred sixty".