18478451 has 2 divisors, whose sum is σ = 18478452. Its totient is φ = 18478450.

The previous prime is 18478441. The next prime is 18478457. The reversal of 18478451 is 15487481.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18478451 - 2¹⁰ = 18477427 is a prime.

It is not a weakly prime, because it can be changed into another prime (18478457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9239225 + 9239226.

It is an arithmetic number, because the mean of its divisors is an integer number (9239226).

Almost surely, 2^18478451 is an apocalyptic number.

18478451 is a deficient number, since it is larger than the sum of its proper divisors (1).

18478451 is an equidigital number, since it uses as much as digits as its factorization.

18478451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35840, while the sum is 38.

The square root of 18478451 is about 4298.6568832602. The cubic root of 18478451 is about 264.3758945511.

The spelling of 18478451 in words is "eighteen million, four hundred seventy-eight thousand, four hundred fifty-one".