18890400215 has 8 divisors (see below), whose sum is σ = 22694333280. Its totient is φ = 15095084832.

The previous prime is 18890400203. The next prime is 18890400233. The reversal of 18890400215 is 51200409881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18890400215 - 2⁸ = 18890399959 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2149595 + ... + 2158364.

It is an arithmetic number, because the mean of its divisors is an integer number (2836791660).

Almost surely, 2^18890400215 is an apocalyptic number.

18890400215 is a deficient number, since it is larger than the sum of its proper divisors (3803933065).

18890400215 is an equidigital number, since it uses as much as digits as its factorization.

18890400215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4308841.

The product of its (nonzero) digits is 23040, while the sum is 38.

The spelling of 18890400215 in words is "eighteen billion, eight hundred ninety million, four hundred thousand, two hundred fifteen".