213783855 has 16 divisors (see below), whose sum is σ = 342762624. Its totient is φ = 113781920.

The previous prime is 213783851. The next prime is 213783863. The reversal of 213783855 is 558387312.

It is not a de Polignac number, because 213783855 - 2² = 213783851 is a prime.

It is a super-2 number, since 2×213783855² = 91407073317322050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213783851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7149 + ... + 21878.

It is an arithmetic number, because the mean of its divisors is an integer number (21422664).

Almost surely, 2^213783855 is an apocalyptic number.

213783855 is a deficient number, since it is larger than the sum of its proper divisors (128978769).

213783855 is a wasteful number, since it uses less digits than its factorization.

213783855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29526.

The product of its digits is 201600, while the sum is 42.

The square root of 213783855 is about 14621.3492879419. The cubic root of 213783855 is about 597.9409558673.

The spelling of 213783855 in words is "two hundred thirteen million, seven hundred eighty-three thousand, eight hundred fifty-five".