821466742 has 4 divisors (see below), whose sum is σ = 1232200116. Its totient is φ = 410733370.

The previous prime is 821466733. The next prime is 821466757. The reversal of 821466742 is 247664128.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 821466695 and 821466704.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205366684 + ... + 205366687.

It is an arithmetic number, because the mean of its divisors is an integer number (308050029).

Almost surely, 2^821466742 is an apocalyptic number.

821466742 is a deficient number, since it is larger than the sum of its proper divisors (410733374).

821466742 is a wasteful number, since it uses less digits than its factorization.

821466742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410733373.

The product of its digits is 129024, while the sum is 40.

The square root of 821466742 is about 28661.2411106009. The cubic root of 821466742 is about 936.5479014800.

It can be divided in two parts, 82146 and 6742, that added together give a palindrome (88888).

The spelling of 821466742 in words is "eight hundred twenty-one million, four hundred sixty-six thousand, seven hundred forty-two".