213987849 has 4 divisors (see below), whose sum is σ = 285317136. Its totient is φ = 142658564.

The previous prime is 213987847. The next prime is 213987887. The reversal of 213987849 is 948789312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213987849 - 2¹ = 213987847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213987847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35664639 + ... + 35664644.

It is an arithmetic number, because the mean of its divisors is an integer number (71329284).

Almost surely, 2^213987849 is an apocalyptic number.

It is an amenable number.

213987849 is a deficient number, since it is larger than the sum of its proper divisors (71329287).

213987849 is an equidigital number, since it uses as much as digits as its factorization.

213987849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71329286.

The product of its digits is 870912, while the sum is 51.

The square root of 213987849 is about 14628.3235198023. The cubic root of 213987849 is about 598.1310818414.

The spelling of 213987849 in words is "two hundred thirteen million, nine hundred eighty-seven thousand, eight hundred forty-nine".