823135406 has 4 divisors (see below), whose sum is σ = 1234703112. Its totient is φ = 411567702.

The previous prime is 823135367. The next prime is 823135463. The reversal of 823135406 is 604531328.

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

It is a super-2 number, since 2×823135406² = 1355103793221569672, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 205783850 + ... + 205783853.

It is an arithmetic number, because the mean of its divisors is an integer number (308675778).

Almost surely, 2^823135406 is an apocalyptic number.

823135406 is a deficient number, since it is larger than the sum of its proper divisors (411567706).

823135406 is a wasteful number, since it uses less digits than its factorization.

823135406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411567705.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 823135406 is about 28690.3364567235. The cubic root of 823135406 is about 937.1816162358.

The spelling of 823135406 in words is "eight hundred twenty-three million, one hundred thirty-five thousand, four hundred six".