18140903 has 4 divisors (see below), whose sum is σ = 19790088. Its totient is φ = 16491720.

The previous prime is 18140897. The next prime is 18140909. The reversal of 18140903 is 30904181.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (18140897) and next prime (18140909).

It is a cyclic number.

It is not a de Polignac number, because 18140903 - 2²² = 13946599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18140909) 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, 824576 + ... + 824597.

It is an arithmetic number, because the mean of its divisors is an integer number (4947522).

Almost surely, 2^18140903 is an apocalyptic number.

18140903 is a deficient number, since it is larger than the sum of its proper divisors (1649185).

18140903 is a wasteful number, since it uses less digits than its factorization.

18140903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649184.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 18140903 is about 4259.2138946054. The cubic root of 18140903 is about 262.7561967370.

The spelling of 18140903 in words is "eighteen million, one hundred forty thousand, nine hundred three".