813240005 has 8 divisors (see below), whose sum is σ = 976041600. Its totient is φ = 650489616.

The previous prime is 813239971. The next prime is 813240017. The reversal of 813240005 is 500042318.

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

It is a cyclic number.

It is not a de Polignac number, because 813240005 - 2⁶ = 813239941 is a prime.

It is a super-2 number, since 2×813240005² = 1322718611464800050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51656 + ... + 65534.

It is an arithmetic number, because the mean of its divisors is an integer number (122005200).

Almost surely, 2^813240005 is an apocalyptic number.

It is an amenable number.

813240005 is a deficient number, since it is larger than the sum of its proper divisors (162801595).

813240005 is a wasteful number, since it uses less digits than its factorization.

813240005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25603.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 813240005 is about 28517.3632196246. The cubic root of 813240005 is about 933.4109931837.

The spelling of 813240005 in words is "eight hundred thirteen million, two hundred forty thousand, five".