18429457 has 2 divisors, whose sum is σ = 18429458. Its totient is φ = 18429456.

The previous prime is 18429443. The next prime is 18429461. The reversal of 18429457 is 75492481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15752961 + 2676496 = 3969^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 18429457 - 2¹⁹ = 17905169 is a prime.

It is not a weakly prime, because it can be changed into another prime (18429427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9214728 + 9214729.

It is an arithmetic number, because the mean of its divisors is an integer number (9214729).

Almost surely, 2^18429457 is an apocalyptic number.

It is an amenable number.

18429457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18429457 is an equidigital number, since it uses as much as digits as its factorization.

18429457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 18429457 is about 4292.9543440386. The cubic root of 18429457 is about 264.1420312033.

The spelling of 18429457 in words is "eighteen million, four hundred twenty-nine thousand, four hundred fifty-seven".