821440274 has 16 divisors (see below), whose sum is σ = 1266447960. Its totient is φ = 399442560.

The previous prime is 821440273. The next prime is 821440337. The reversal of 821440274 is 472044128.

821440274 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 372297025 + 449143249 = 19295^2 + 21193^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 821440274.

It is not an unprimeable number, because it can be changed into a prime (821440271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26969 + ... + 48684.

Almost surely, 2^821440274 is an apocalyptic number.

821440274 is a deficient number, since it is larger than the sum of its proper divisors (445007686).

821440274 is a wasteful number, since it uses less digits than its factorization.

821440274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75805.

The product of its (nonzero) digits is 14336, while the sum is 32.

The square root of 821440274 is about 28660.7793683284. The cubic root of 821440274 is about 936.5378427177.

The spelling of 821440274 in words is "eight hundred twenty-one million, four hundred forty thousand, two hundred seventy-four".