813040403 has 8 divisors (see below), whose sum is σ = 935426400. Its totient is φ = 692213760.

The previous prime is 813040399. The next prime is 813040421. The reversal of 813040403 is 304040318.

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

It is not a de Polignac number, because 813040403 - 2² = 813040399 is a prime.

It is a super-2 number, since 2×813040403² = 1322069393820804818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (813040003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388718 + ... + 390803.

It is an arithmetic number, because the mean of its divisors is an integer number (116928300).

Almost surely, 2^813040403 is an apocalyptic number.

813040403 is a deficient number, since it is larger than the sum of its proper divisors (122385997).

813040403 is a wasteful number, since it uses less digits than its factorization.

813040403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779677.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 813040403 is about 28513.8633475017. The cubic root of 813040403 is about 933.3346213276.

The spelling of 813040403 in words is "eight hundred thirteen million, forty thousand, four hundred three".