18090403 has 16 divisors (see below), whose sum is σ = 19404000. Its totient is φ = 16837632.

The previous prime is 18090379. The next prime is 18090409. The reversal of 18090403 is 30409081.

It is not a de Polignac number, because 18090403 - 2²¹ = 15993251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18090409) 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, 165913 + ... + 166021.

It is an arithmetic number, because the mean of its divisors is an integer number (1212750).

Almost surely, 2^18090403 is an apocalyptic number.

18090403 is a deficient number, since it is larger than the sum of its proper divisors (1313597).

18090403 is a wasteful number, since it uses less digits than its factorization.

18090403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 18090403 is about 4253.2814390774. The cubic root of 18090403 is about 262.5121530277.

Adding to 18090403 its reverse (30409081), we get a palindrome (48499484).

The spelling of 18090403 in words is "eighteen million, ninety thousand, four hundred three".