1818396400 has 60 divisors (see below), whose sum is σ = 4391754624. Its totient is φ = 723520000.

The previous prime is 1818396361. The next prime is 1818396403. The reversal of 1818396400 is 46938181.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818396403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64500 + ... + 88300.

Almost surely, 2^1818396400 is an apocalyptic number.

1818396400 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 1818396400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2195877312).

1818396400 is an abundant number, since it is smaller than the sum of its proper divisors (2573358224).

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

1818396400 is a wasteful number, since it uses less digits than its factorization.

1818396400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24010 (or 23999 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 1818396400 is about 42642.6593917406. The cubic root of 1818396400 is about 1220.5704579345.

The spelling of 1818396400 in words is "one billion, eight hundred eighteen million, three hundred ninety-six thousand, four hundred".