18321429 has 16 divisors (see below), whose sum is σ = 28101248. Its totient is φ = 10400832.

The previous prime is 18321419. The next prime is 18321431. The reversal of 18321429 is 92412381.

It is not a de Polignac number, because 18321429 - 2²¹ = 16224277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18321396 and 18321405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18321419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 519 + ... + 6075.

It is an arithmetic number, because the mean of its divisors is an integer number (1756328).

Almost surely, 2^18321429 is an apocalyptic number.

It is an amenable number.

18321429 is a deficient number, since it is larger than the sum of its proper divisors (9779819).

18321429 is a wasteful number, since it uses less digits than its factorization.

18321429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5724.

The product of its digits is 3456, while the sum is 30.

The square root of 18321429 is about 4280.3538405137. The cubic root of 18321429 is about 263.6249121210.

It can be divided in two parts, 183 and 21429, that added together give a palindrome (21612).

The spelling of 18321429 in words is "eighteen million, three hundred twenty-one thousand, four hundred twenty-nine".