203406890189 has 4 divisors (see below), whose sum is σ = 203674179900. Its totient is φ = 203139600480.

The previous prime is 203406890173. The next prime is 203406890191. The reversal of 203406890189 is 981098604302.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9075801289 + 194331088900 = 95267^2 + 440830^2 .

It is a cyclic number.

It is not a de Polignac number, because 203406890189 - 2⁴ = 203406890173 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 (203406890149) 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, 133643714 + ... + 133645235.

It is an arithmetic number, because the mean of its divisors is an integer number (50918544975).

Almost surely, 2^203406890189 is an apocalyptic number.

It is an amenable number.

203406890189 is a deficient number, since it is larger than the sum of its proper divisors (267289711).

203406890189 is an equidigital number, since it uses as much as digits as its factorization.

203406890189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267289710.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 203406890189 in words is "two hundred three billion, four hundred six million, eight hundred ninety thousand, one hundred eighty-nine".