90203903 has 4 divisors (see below), whose sum is σ = 91217520. Its totient is φ = 89190288.

The previous prime is 90203899. The next prime is 90203917. The reversal of 90203903 is 30930209.

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

It is a cyclic number.

It is not a de Polignac number, because 90203903 - 2² = 90203899 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 (90203303) 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, 506675 + ... + 506852.

It is an arithmetic number, because the mean of its divisors is an integer number (22804380).

Almost surely, 2^90203903 is an apocalyptic number.

90203903 is a deficient number, since it is larger than the sum of its proper divisors (1013617).

90203903 is a wasteful number, since it uses less digits than its factorization.

90203903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013616.

The product of its (nonzero) digits is 1458, while the sum is 26.

The square root of 90203903 is about 9497.5735322239. The cubic root of 90203903 is about 448.4786534195.

The spelling of 90203903 in words is "ninety million, two hundred three thousand, nine hundred three".