403312993 has 4 divisors (see below), whose sum is σ = 403387668. Its totient is φ = 403238320.

The previous prime is 403312979. The next prime is 403313017. The reversal of 403312993 is 399213304.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 321735969 + 81577024 = 17937^2 + 9032^2 .

It is a cyclic number.

It is not a de Polignac number, because 403312993 - 2²⁵ = 369758561 is a prime.

It is a super-2 number, since 2×403312993² = 325322740645236098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (403312963) 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, 28546 + ... + 40267.

It is an arithmetic number, because the mean of its divisors is an integer number (100846917).

Almost surely, 2^403312993 is an apocalyptic number.

It is an amenable number.

403312993 is a deficient number, since it is larger than the sum of its proper divisors (74675).

403312993 is an equidigital number, since it uses as much as digits as its factorization.

403312993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74674.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 403312993 is about 20082.6540327717. The cubic root of 403312993 is about 738.8349044606.

The spelling of 403312993 in words is "four hundred three million, three hundred twelve thousand, nine hundred ninety-three".