203871997 has 8 divisors (see below), whose sum is σ = 237752000. Its totient is φ = 174747132.

The previous prime is 203871979. The next prime is 203872003. The reversal of 203871997 is 799178302.

It is a happy number.

It is not a de Polignac number, because 203871997 - 2²³ = 195483389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203871397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296847 + ... + 297532.

It is an arithmetic number, because the mean of its divisors is an integer number (29719000).

Almost surely, 2^203871997 is an apocalyptic number.

It is an amenable number.

203871997 is a deficient number, since it is larger than the sum of its proper divisors (33880003).

203871997 is an frugal number, since it uses more digits than its factorization.

203871997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594400 (or 594386 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 203871997 is about 14278.3751526566. The cubic root of 203871997 is about 588.5533811525.

The spelling of 203871997 in words is "two hundred three million, eight hundred seventy-one thousand, nine hundred ninety-seven".