203005993 has 4 divisors (see below), whose sum is σ = 214947540. Its totient is φ = 191064448.

The previous prime is 203005973. The next prime is 203006057. The reversal of 203005993 is 399500302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 399500302 = 2 ⋅199750151.

It can be written as a sum of positive squares in 2 ways, for example, as 54361129 + 148644864 = 7373^2 + 12192^2 .

It is a cyclic number.

It is not a de Polignac number, because 203005993 - 2¹³ = 202997801 is a prime.

It is a super-2 number, since 2×203005993² = 82422866387832098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203005903) 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, 5970748 + ... + 5970781.

It is an arithmetic number, because the mean of its divisors is an integer number (53736885).

Almost surely, 2^203005993 is an apocalyptic number.

It is an amenable number.

203005993 is a deficient number, since it is larger than the sum of its proper divisors (11941547).

203005993 is a wasteful number, since it uses less digits than its factorization.

203005993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11941546.

The product of its (nonzero) digits is 7290, while the sum is 31.

The square root of 203005993 is about 14248.0171602929. The cubic root of 203005993 is about 587.7188493853.

The spelling of 203005993 in words is "two hundred three million, five thousand, nine hundred ninety-three".