213739 has 4 divisors (see below), whose sum is σ = 223056. Its totient is φ = 204424.

The previous prime is 213737. The next prime is 213751. The reversal of 213739 is 937312.

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

It is not a de Polignac number, because 213739 - 2¹ = 213737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213737) 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, 4624 + ... + 4669.

It is an arithmetic number, because the mean of its divisors is an integer number (55764).

2²¹³⁷³⁹ is an apocalyptic number.

213739 is a deficient number, since it is larger than the sum of its proper divisors (9317).

213739 is an equidigital number, since it uses as much as digits as its factorization.

213739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9316.

The product of its digits is 1134, while the sum is 25.

The square root of 213739 is about 462.3191538321. The cubic root of 213739 is about 59.7899134004.

The spelling of 213739 in words is "two hundred thirteen thousand, seven hundred thirty-nine".