1819166400 has 504 divisors, whose sum is σ = 6981088400. Its totient is φ = 447897600.

The previous prime is 1819166389. The next prime is 1819166407. The reversal of 1819166400 is 46619181.

It is a happy number.

1819166400 is a `hidden beast` number, since 1 + 8 + 1 + 9 + 1 + 6 + 640 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1819166407) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16689546 + ... + 16689654.

Almost surely, 2^1819166400 is an apocalyptic number.

1819166400 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 1819166400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3490544200).

1819166400 is an abundant number, since it is smaller than the sum of its proper divisors (5161922000).

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

1819166400 is a wasteful number, since it uses less digits than its factorization.

1819166400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1819166400 is about 42651.6869537419. The cubic root of 1819166400 is about 1220.7427171524.

The spelling of 1819166400 in words is "one billion, eight hundred nineteen million, one hundred sixty-six thousand, four hundred".