1813946400 has 864 divisors, whose sum is σ = 8007487488. Its totient is φ = 391910400.

The previous prime is 1813946383. The next prime is 1813946467. The reversal of 1813946400 is 46493181.

1813946400 is a `hidden beast` number, since 1 + 8 + 1 + 3 + 9 + 4 + 640 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 42184779 + ... + 42184821.

Almost surely, 2^1813946400 is an apocalyptic number.

1813946400 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 1813946400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4003743744).

1813946400 is an abundant number, since it is smaller than the sum of its proper divisors (6193541088).

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

1813946400 is a wasteful number, since it uses less digits than its factorization.

1813946400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1813946400 is about 42590.4496336914. The cubic root of 1813946400 is about 1219.5739800710.

The spelling of 1813946400 in words is "one billion, eight hundred thirteen million, nine hundred forty-six thousand, four hundred".