213989 has 2 divisors, whose sum is σ = 213990. Its totient is φ = 213988.

The previous prime is 213977. The next prime is 214003. The reversal of 213989 is 989312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 209764 + 4225 = 458^2 + 65^2 .

It is a cyclic number.

It is not a de Polignac number, because 213989 - 2⁴ = 213973 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213989.

It is not a weakly prime, because it can be changed into another prime (213919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106994 + 106995.

It is an arithmetic number, because the mean of its divisors is an integer number (106995).

2²¹³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

213989 is a deficient number, since it is larger than the sum of its proper divisors (1).

213989 is an equidigital number, since it uses as much as digits as its factorization.

213989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 32.

The square root of 213989 is about 462.5894508092. The cubic root of 213989 is about 59.8132154251.

The spelling of 213989 in words is "two hundred thirteen thousand, nine hundred eighty-nine".