18890400203 has 2 divisors, whose sum is σ = 18890400204. Its totient is φ = 18890400202.

The previous prime is 18890400167. The next prime is 18890400233. The reversal of 18890400203 is 30200409881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18890400203 - 2¹⁰ = 18890399179 is a prime.

It is not a weakly prime, because it can be changed into another prime (18890400233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9445200101 + 9445200102.

It is an arithmetic number, because the mean of its divisors is an integer number (9445200102).

Almost surely, 2^18890400203 is an apocalyptic number.

18890400203 is a deficient number, since it is larger than the sum of its proper divisors (1).

18890400203 is an equidigital number, since it uses as much as digits as its factorization.

18890400203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 35.

The spelling of 18890400203 in words is "eighteen billion, eight hundred ninety million, four hundred thousand, two hundred three".