203989 has 2 divisors, whose sum is σ = 203990. Its totient is φ = 203988.

The previous prime is 203977. The next prime is 203999. The reversal of 203989 is 989302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116964 + 87025 = 342^2 + 295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203989 is a prime.

It is a super-2 number, since 2×203989² = 83223024242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 203989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (203909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101994 + 101995.

It is an arithmetic number, because the mean of its divisors is an integer number (101995).

2²⁰³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

203989 is a deficient number, since it is larger than the sum of its proper divisors (1).

203989 is an equidigital number, since it uses as much as digits as its factorization.

203989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 203989 is about 451.6514142566. The cubic root of 203989 is about 58.8665950711.

The spelling of 203989 in words is "two hundred three thousand, nine hundred eighty-nine".