213849749 has 16 divisors (see below), whose sum is σ = 236597760. Its totient is φ = 192391680.

The previous prime is 213849743. The next prime is 213849767. The reversal of 213849749 is 947948312.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213849749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213849743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41297 + ... + 46185.

It is an arithmetic number, because the mean of its divisors is an integer number (14787360).

Almost surely, 2^213849749 is an apocalyptic number.

It is an amenable number.

213849749 is a deficient number, since it is larger than the sum of its proper divisors (22748011).

213849749 is a wasteful number, since it uses less digits than its factorization.

213849749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5020.

The product of its digits is 435456, while the sum is 47.

The square root of 213849749 is about 14623.6024631416. The cubic root of 213849749 is about 598.0023834463.

The spelling of 213849749 in words is "two hundred thirteen million, eight hundred forty-nine thousand, seven hundred forty-nine".