213438891 has 8 divisors (see below), whose sum is σ = 290640384. Its totient is φ = 139265000.

The previous prime is 213438877. The next prime is 213438917. The reversal of 213438891 is 198834312.

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

It is a cyclic number.

It is not a de Polignac number, because 213438891 - 2¹¹ = 213436843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213438391) 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, 756735 + ... + 757016.

It is an arithmetic number, because the mean of its divisors is an integer number (36330048).

Almost surely, 2^213438891 is an apocalyptic number.

213438891 is a deficient number, since it is larger than the sum of its proper divisors (77201493).

213438891 is a wasteful number, since it uses less digits than its factorization.

213438891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513801.

The product of its digits is 41472, while the sum is 39.

The square root of 213438891 is about 14609.5479396181. The cubic root of 213438891 is about 597.6191680052.

The spelling of 213438891 in words is "two hundred thirteen million, four hundred thirty-eight thousand, eight hundred ninety-one".