1818198720 has 168 divisors, whose sum is σ = 6735049776. Its totient is φ = 447547392.

The previous prime is 1818198719. The next prime is 1818198727. The reversal of 1818198720 is 278918181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1818198727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13159 + ... + 61721.

It is an arithmetic number, because the mean of its divisors is an integer number (40089582).

Almost surely, 2^1818198720 is an apocalyptic number.

1818198720 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 1818198720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3367524888).

1818198720 is an abundant number, since it is smaller than the sum of its proper divisors (4916851056).

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

1818198720 is a wasteful number, since it uses less digits than its factorization.

1818198720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48599 (or 48586 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The square root of 1818198720 is about 42640.3414620474. The cubic root of 1818198720 is about 1220.5262264508.

The spelling of 1818198720 in words is "one billion, eight hundred eighteen million, one hundred ninety-eight thousand, seven hundred twenty".