821203394 has 16 divisors (see below), whose sum is σ = 1422834336. Its totient is φ = 351316800.

The previous prime is 821203381. The next prime is 821203421. The reversal of 821203394 is 493302128.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 821203394.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1097492 + ... + 1098239.

It is an arithmetic number, because the mean of its divisors is an integer number (88927146).

Almost surely, 2^821203394 is an apocalyptic number.

821203394 is a deficient number, since it is larger than the sum of its proper divisors (601630942).

821203394 is a wasteful number, since it uses less digits than its factorization.

821203394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195761.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 821203394 is about 28656.6465937660. The cubic root of 821203394 is about 936.4478104417.

The spelling of 821203394 in words is "eight hundred twenty-one million, two hundred three thousand, three hundred ninety-four".