213943906 has 16 divisors (see below), whose sum is σ = 357540480. Its totient is φ = 95177680.

The previous prime is 213943883. The next prime is 213943909. The reversal of 213943906 is 609349312.

It is not an unprimeable number, because it can be changed into a prime (213943909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102421 + ... + 104488.

It is an arithmetic number, because the mean of its divisors is an integer number (22346280).

Almost surely, 2^213943906 is an apocalyptic number.

213943906 is a deficient number, since it is larger than the sum of its proper divisors (143596574).

213943906 is a wasteful number, since it uses less digits than its factorization.

213943906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206969.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 213943906 is about 14626.8214592235. The cubic root of 213943906 is about 598.0901364114.

The spelling of 213943906 in words is "two hundred thirteen million, nine hundred forty-three thousand, nine hundred six".