747805 has 4 divisors (see below), whose sum is σ = 897372. Its totient is φ = 598240.

The previous prime is 747781. The next prime is 747811. The reversal of 747805 is 508747.

It is a happy number.

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 213444 + 534361 = 462^2 + 731^2 .

It is not a de Polignac number, because 747805 - 2¹¹ = 745757 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74776 + ... + 74785.

It is an arithmetic number, because the mean of its divisors is an integer number (224343).

2⁷⁴⁷⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

747805 is a deficient number, since it is larger than the sum of its proper divisors (149567).

747805 is a wasteful number, since it uses less digits than its factorization.

747805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149566.

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 747805 is about 864.7571913549. The cubic root of 747805 is about 90.7673079278.

The spelling of 747805 in words is "seven hundred forty-seven thousand, eight hundred five".