213523994 has 8 divisors (see below), whose sum is σ = 323884980. Its totient is φ = 105562336.

The previous prime is 213523987. The next prime is 213523997. The reversal of 213523994 is 499325312.

It is a happy number.

213523994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 173896969 + 39627025 = 13187^2 + 6295^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (213523997) 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, 599609 + ... + 599964.

Almost surely, 2^213523994 is an apocalyptic number.

213523994 is a deficient number, since it is larger than the sum of its proper divisors (110360986).

213523994 is a wasteful number, since it uses less digits than its factorization.

213523994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199664.

The product of its digits is 58320, while the sum is 38.

The square root of 213523994 is about 14612.4602309125. The cubic root of 213523994 is about 597.6985856248.

The spelling of 213523994 in words is "two hundred thirteen million, five hundred twenty-three thousand, nine hundred ninety-four".