18042433 has 4 divisors (see below), whose sum is σ = 18137088. Its totient is φ = 17947780.

The previous prime is 18042361. The next prime is 18042463. The reversal of 18042433 is 33424081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33424081 = 347 ⋅96323.

It is a cyclic number.

It is not a de Polignac number, because 18042433 - 2⁹ = 18041921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18042398 and 18042407.

It is not an unprimeable number, because it can be changed into a prime (18042463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47041 + ... + 47422.

It is an arithmetic number, because the mean of its divisors is an integer number (4534272).

Almost surely, 2^18042433 is an apocalyptic number.

It is an amenable number.

18042433 is a deficient number, since it is larger than the sum of its proper divisors (94655).

18042433 is an equidigital number, since it uses as much as digits as its factorization.

18042433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94654.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 18042433 is about 4247.6385204017. The cubic root of 18042433 is about 262.2799146962.

The spelling of 18042433 in words is "eighteen million, forty-two thousand, four hundred thirty-three".