203990 has 8 divisors (see below), whose sum is σ = 367200. Its totient is φ = 81592.

The previous prime is 203989. The next prime is 203999. The reversal of 203990 is 99302.

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

It is a super-2 number, since 2×203990² = 83223840200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203999) 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, 10190 + ... + 10209.

It is an arithmetic number, because the mean of its divisors is an integer number (45900).

2²⁰³⁹⁹⁰ is an apocalyptic number.

203990 is a deficient number, since it is larger than the sum of its proper divisors (163210).

203990 is a wasteful number, since it uses less digits than its factorization.

203990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20406.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 203990 is about 451.6525213037. The cubic root of 203990 is about 58.8666912634.

It can be divided in two parts, 20 and 3990, that multiplied together give a triangular number (79800 = T₃₉₉).

The spelling of 203990 in words is "two hundred three thousand, nine hundred ninety".