18454477 has 2 divisors, whose sum is σ = 18454478. Its totient is φ = 18454476.

The previous prime is 18454451. The next prime is 18454481. The reversal of 18454477 is 77445481.

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., 18369796 + 84681 = 4286^2 + 291^2 .

It is a cyclic number.

It is not a de Polignac number, because 18454477 - 2¹⁵ = 18421709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18454427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9227238 + 9227239.

It is an arithmetic number, because the mean of its divisors is an integer number (9227239).

Almost surely, 2^18454477 is an apocalyptic number.

It is an amenable number.

18454477 is a deficient number, since it is larger than the sum of its proper divisors (1).

18454477 is an equidigital number, since it uses as much as digits as its factorization.

18454477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125440, while the sum is 40.

The square root of 18454477 is about 4295.8674327777. The cubic root of 18454477 is about 264.2615110327.

The spelling of 18454477 in words is "eighteen million, four hundred fifty-four thousand, four hundred seventy-seven".