213685946 has 4 divisors (see below), whose sum is σ = 320528922. Its totient is φ = 106842972.

The previous prime is 213685943. The next prime is 213685957. The reversal of 213685946 is 649586312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 191961025 + 21724921 = 13855^2 + 4661^2 .

It is a junction number, because it is equal to n+sod(n) for n = 213685897 and 213685906.

It is not an unprimeable number, because it can be changed into a prime (213685943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53421485 + ... + 53421488.

Almost surely, 2^213685946 is an apocalyptic number.

213685946 is a deficient number, since it is larger than the sum of its proper divisors (106842976).

213685946 is a wasteful number, since it uses less digits than its factorization.

213685946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106842975.

The product of its digits is 311040, while the sum is 44.

The square root of 213685946 is about 14618.0007524969. Note that the first 3 decimals coincide. The cubic root of 213685946 is about 597.8496600105.

The spelling of 213685946 in words is "two hundred thirteen million, six hundred eighty-five thousand, nine hundred forty-six".