18903445 has 16 divisors (see below), whose sum is σ = 25324992. Its totient is φ = 13426560.

The previous prime is 18903433. The next prime is 18903449. The reversal of 18903445 is 54430981.

It is not a de Polignac number, because 18903445 - 2⁵ = 18903413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18903445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18903449) 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, 1632 + ... + 6361.

It is an arithmetic number, because the mean of its divisors is an integer number (1582812).

Almost surely, 2^18903445 is an apocalyptic number.

It is an amenable number.

18903445 is a deficient number, since it is larger than the sum of its proper divisors (6421547).

18903445 is a wasteful number, since it uses less digits than its factorization.

18903445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8052.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 18903445 is about 4347.8092184455. The cubic root of 18903445 is about 266.3873838215.

It can be divided in two parts, 1890 and 3445, that added together give a palindrome (5335).

The spelling of 18903445 in words is "eighteen million, nine hundred three thousand, four hundred forty-five".