213117894 has 24 divisors (see below), whose sum is σ = 503733672. Its totient is φ = 64581120.

The previous prime is 213117893. The next prime is 213117913. The reversal of 213117894 is 498711312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213117893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 537979 + ... + 538374.

It is an arithmetic number, because the mean of its divisors is an integer number (20988903).

Almost surely, 2^213117894 is an apocalyptic number.

213117894 is an abundant number, since it is smaller than the sum of its proper divisors (290615778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

213117894 is a wasteful number, since it uses less digits than its factorization.

213117894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076372 (or 1076369 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 213117894 is about 14598.5579424819. The cubic root of 213117894 is about 597.3194253672.

The spelling of 213117894 in words is "two hundred thirteen million, one hundred seventeen thousand, eight hundred ninety-four".