18023402 has 8 divisors (see below), whose sum is σ = 27438816. Its totient is φ = 8877132.

The previous prime is 18023393. The next prime is 18023429. The reversal of 18023402 is 20432081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67118 + ... + 67385.

It is an arithmetic number, because the mean of its divisors is an integer number (3429852).

Almost surely, 2^18023402 is an apocalyptic number.

18023402 is a deficient number, since it is larger than the sum of its proper divisors (9415414).

18023402 is a wasteful number, since it uses less digits than its factorization.

18023402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134572.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 18023402 is about 4245.3977434394. The cubic root of 18023402 is about 262.1876654032.

Adding to 18023402 its reverse (20432081), we get a palindrome (38455483).

The spelling of 18023402 in words is "eighteen million, twenty-three thousand, four hundred two".