18428197 has 2 divisors, whose sum is σ = 18428198. Its totient is φ = 18428196.

The previous prime is 18428177. The next prime is 18428213. The reversal of 18428197 is 79182481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18198756 + 229441 = 4266^2 + 479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18428197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18428177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214098 + 9214099.

It is an arithmetic number, because the mean of its divisors is an integer number (9214099).

Almost surely, 2^18428197 is an apocalyptic number.

It is an amenable number.

18428197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18428197 is an equidigital number, since it uses as much as digits as its factorization.

18428197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 40.

The square root of 18428197 is about 4292.8075894454. The cubic root of 18428197 is about 264.1360113742.

The spelling of 18428197 in words is "eighteen million, four hundred twenty-eight thousand, one hundred ninety-seven".