213256646 has 16 divisors (see below), whose sum is σ = 337005360. Its totient is φ = 100931040.

The previous prime is 213256643. The next prime is 213256663. The reversal of 213256646 is 646652312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213256643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88376 + ... + 90756.

It is an arithmetic number, because the mean of its divisors is an integer number (21062835).

Almost surely, 2^213256646 is an apocalyptic number.

213256646 is a deficient number, since it is larger than the sum of its proper divisors (123748714).

213256646 is a wasteful number, since it uses less digits than its factorization.

213256646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4759.

The product of its digits is 51840, while the sum is 35.

The square root of 213256646 is about 14603.3094194433. The cubic root of 213256646 is about 597.4490270061.

The spelling of 213256646 in words is "two hundred thirteen million, two hundred fifty-six thousand, six hundred forty-six".