90018403 has 2 divisors, whose sum is σ = 90018404. Its totient is φ = 90018402.

The previous prime is 90018391. The next prime is 90018419. The reversal of 90018403 is 30481009.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90018403 - 2²⁵ = 56463971 is a prime.

It is not a weakly prime, because it can be changed into another prime (90018443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45009201 + 45009202.

It is an arithmetic number, because the mean of its divisors is an integer number (45009202).

Almost surely, 2^90018403 is an apocalyptic number.

90018403 is a deficient number, since it is larger than the sum of its proper divisors (1).

90018403 is an equidigital number, since it uses as much as digits as its factorization.

90018403 is an evil number, because the sum of its binary digits is even.

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

The square root of 90018403 is about 9487.8028541913. The cubic root of 90018403 is about 448.1710174968.

The spelling of 90018403 in words is "ninety million, eighteen thousand, four hundred three".