823128473 has 4 divisors (see below), whose sum is σ = 824606820. Its totient is φ = 821650128.

The previous prime is 823128409. The next prime is 823128533. The reversal of 823128473 is 374821328.

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 455907904 + 367220569 = 21352^2 + 19163^2 .

It is a cyclic number.

It is not a de Polignac number, because 823128473 - 2⁶ = 823128409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (823128673) 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, 738338 + ... + 739451.

It is an arithmetic number, because the mean of its divisors is an integer number (206151705).

Almost surely, 2^823128473 is an apocalyptic number.

It is an amenable number.

823128473 is a deficient number, since it is larger than the sum of its proper divisors (1478347).

823128473 is a wasteful number, since it uses less digits than its factorization.

823128473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478346.

The product of its digits is 64512, while the sum is 38.

The square root of 823128473 is about 28690.2156318143. The cubic root of 823128473 is about 937.1789850371.

The spelling of 823128473 in words is "eight hundred twenty-three million, one hundred twenty-eight thousand, four hundred seventy-three".