1821404160 has 396 divisors, whose sum is σ = 6675316128. Its totient is φ = 458981376.

The previous prime is 1821404159. The next prime is 1821404203. The reversal of 1821404160 is 614041281.

It is a happy number.

It is a super-2 number, since 2×1821404160² = 6635026228130611200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 38753257 + ... + 38753303.

Almost surely, 2^1821404160 is an apocalyptic number.

1821404160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1821404160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3337658064).

1821404160 is an abundant number, since it is smaller than the sum of its proper divisors (4853911968).

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

1821404160 is a wasteful number, since it uses less digits than its factorization.

1821404160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1821404160 is about 42677.9118514484. The cubic root of 1821404160 is about 1221.2430580202.

The spelling of 1821404160 in words is "one billion, eight hundred twenty-one million, four hundred four thousand, one hundred sixty".