1018198720 has 336 divisors, whose sum is σ = 3196157184. Its totient is φ = 299980800.

The previous prime is 1018198711. The next prime is 1018198721. The reversal of 1018198720 is 278918101.

It is a self number, because there is not a number n which added to its sum of digits gives 1018198720.

It is not an unprimeable number, because it can be changed into a prime (1018198721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23679019 + ... + 23679061.

Almost surely, 2^1018198720 is an apocalyptic number.

1018198720 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 1018198720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1598078592).

1018198720 is an abundant number, since it is smaller than the sum of its proper divisors (2177958464).

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

1018198720 is a wasteful number, since it uses less digits than its factorization.

1018198720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 1018198720 is about 31909.2262519792. The cubic root of 1018198720 is about 1006.0298083330.

The spelling of 1018198720 in words is "one billion, eighteen million, one hundred ninety-eight thousand, seven hundred twenty".