213979 has 8 divisors (see below), whose sum is σ = 232848. Its totient is φ = 195840.

The previous prime is 213977. The next prime is 213989. The reversal of 213979 is 979312.

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

It is not a de Polignac number, because 213979 - 2¹ = 213977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 213979.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213973) 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 7 ways as a sum of consecutive naturals, for example, 544 + ... + 850.

It is an arithmetic number, because the mean of its divisors is an integer number (29106).

2²¹³⁹⁷⁹ is an apocalyptic number.

213979 is a deficient number, since it is larger than the sum of its proper divisors (18869).

213979 is a wasteful number, since it uses less digits than its factorization.

213979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365.

The product of its digits is 3402, while the sum is 31.

The square root of 213979 is about 462.5786419626. The cubic root of 213979 is about 59.8122836926.

The spelling of 213979 in words is "two hundred thirteen thousand, nine hundred seventy-nine".