203406393 has 4 divisors (see below), whose sum is σ = 271208528. Its totient is φ = 135604260.

The previous prime is 203406389. The next prime is 203406403. The reversal of 203406393 is 393604302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 203406393 - 2² = 203406389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203406393.

It is not an unprimeable number, because it can be changed into a prime (203406323) 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, 33901063 + ... + 33901068.

It is an arithmetic number, because the mean of its divisors is an integer number (67802132).

Almost surely, 2^203406393 is an apocalyptic number.

It is an amenable number.

203406393 is a deficient number, since it is larger than the sum of its proper divisors (67802135).

203406393 is an equidigital number, since it uses as much as digits as its factorization.

203406393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67802134.

The product of its (nonzero) digits is 11664, while the sum is 30.

The square root of 203406393 is about 14262.0613166541. The cubic root of 203406393 is about 588.1049924737.

The spelling of 203406393 in words is "two hundred three million, four hundred six thousand, three hundred ninety-three".