213406849 has 4 divisors (see below), whose sum is σ = 215364820. Its totient is φ = 211448880.

The previous prime is 213406847. The next prime is 213406867. The reversal of 213406849 is 948604312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 101364624 + 112042225 = 10068^2 + 10585^2 .

It is a cyclic number.

It is not a de Polignac number, because 213406849 - 2¹ = 213406847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213406847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 978822 + ... + 979039.

It is an arithmetic number, because the mean of its divisors is an integer number (53841205).

Almost surely, 2^213406849 is an apocalyptic number.

It is an amenable number.

213406849 is a deficient number, since it is larger than the sum of its proper divisors (1957971).

213406849 is a wasteful number, since it uses less digits than its factorization.

213406849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957970.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 213406849 is about 14608.4512868408. The cubic root of 213406849 is about 597.5892611287.

The spelling of 213406849 in words is "two hundred thirteen million, four hundred six thousand, eight hundred forty-nine".