1201720818 has 8 divisors (see below), whose sum is σ = 2403441648. Its totient is φ = 400573604.

The previous prime is 1201720789. The next prime is 1201720829. The reversal of 1201720818 is 8180271021.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

1201720818 is an admirable number.

It is a super-3 number, since 3×1201720818³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100143396 + ... + 100143407.

It is an arithmetic number, because the mean of its divisors is an integer number (300430206).

Almost surely, 2^1201720818 is an apocalyptic number.

1201720818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1201720818 is a wasteful number, since it uses less digits than its factorization.

1201720818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200286808.

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 1201720818 is about 34665.8451216756. The cubic root of 1201720818 is about 1063.1662826797.

Adding to 1201720818 its reverse (8180271021), we get a palindrome (9381991839).

The spelling of 1201720818 in words is "one billion, two hundred one million, seven hundred twenty thousand, eight hundred eighteen".