18072801 has 20 divisors (see below), whose sum is σ = 27117552. Its totient is φ = 11995128.

The previous prime is 18072797. The next prime is 18072809. The reversal of 18072801 is 10827081.

It is not a de Polignac number, because 18072801 - 2² = 18072797 is a prime.

It is a super-2 number, since 2×18072801² = 653252271971202, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18072809) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 27786 + ... + 28428.

Almost surely, 2^18072801 is an apocalyptic number.

It is an amenable number.

18072801 is a deficient number, since it is larger than the sum of its proper divisors (9044751).

18072801 is an equidigital number, since it uses as much as digits as its factorization.

18072801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002 (or 993 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 27.

The square root of 18072801 is about 4251.2117096188. The cubic root of 18072801 is about 262.4269837735.

Adding to 18072801 its reverse (10827081), we get a palindrome (28899882).

The spelling of 18072801 in words is "eighteen million, seventy-two thousand, eight hundred one".