18672201 has 20 divisors (see below), whose sum is σ = 28858500. Its totient is φ = 12017376.

The previous prime is 18672187. The next prime is 18672221. The reversal of 18672201 is 10227681.

It can be written as a sum of positive squares in 2 ways, for example, as 9363600 + 9308601 = 3060^2 + 3051^2 .

It is not a de Polignac number, because 18672201 - 2¹⁵ = 18639433 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18672221) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1626 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (1442925).

Almost surely, 2^18672201 is an apocalyptic number.

It is an amenable number.

18672201 is a deficient number, since it is larger than the sum of its proper divisors (10186299).

18672201 is an equidigital number, since it uses as much as digits as its factorization.

18672201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7990 (or 7981 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 18672201 is about 4321.1342261031. The cubic root of 18672201 is about 265.2966939228.

Adding to 18672201 its reverse (10227681), we get a palindrome (28899882).

The spelling of 18672201 in words is "eighteen million, six hundred seventy-two thousand, two hundred one".