18223903 has 2 divisors, whose sum is σ = 18223904. Its totient is φ = 18223902.

The previous prime is 18223853. The next prime is 18223913. The reversal of 18223903 is 30932281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18223903 - 2¹³ = 18215711 is a prime.

It is a super-2 number, since 2×18223903² = 664221281106818, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18223913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9111951 + 9111952.

It is an arithmetic number, because the mean of its divisors is an integer number (9111952).

Almost surely, 2^18223903 is an apocalyptic number.

18223903 is a deficient number, since it is larger than the sum of its proper divisors (1).

18223903 is an equidigital number, since it uses as much as digits as its factorization.

18223903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 18223903 is about 4268.9463571237. The cubic root of 18223903 is about 263.1563162551.

The spelling of 18223903 in words is "eighteen million, two hundred twenty-three thousand, nine hundred three".