18890400213 has 12 divisors (see below), whose sum is σ = 27287627328. Its totient is φ = 12592910760.

The previous prime is 18890400203. The next prime is 18890400233. The reversal of 18890400213 is 31200409881.

It is not a de Polignac number, because 18890400213 - 2⁹ = 18890399701 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18890400203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159028 + ... + 251138.

It is an arithmetic number, because the mean of its divisors is an integer number (2273968944).

Almost surely, 2^18890400213 is an apocalyptic number.

It is an amenable number.

18890400213 is a deficient number, since it is larger than the sum of its proper divisors (8397227115).

18890400213 is a wasteful number, since it uses less digits than its factorization.

18890400213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114904 (or 114901 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 18890400213 in words is "eighteen billion, eight hundred ninety million, four hundred thousand, two hundred thirteen".