821993370 has 32 divisors (see below), whose sum is σ = 2152128960. Its totient is φ = 199271040.

The previous prime is 821993357. The next prime is 821993413. The reversal of 821993370 is 73399128.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1245115 + ... + 1245774.

It is an arithmetic number, because the mean of its divisors is an integer number (67254030).

Almost surely, 2^821993370 is an apocalyptic number.

821993370 is an abundant number, since it is smaller than the sum of its proper divisors (1330135590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821993370 is a wasteful number, since it uses less digits than its factorization.

821993370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2490910.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 821993370 is about 28670.4267495271. The cubic root of 821993370 is about 936.7479935689.

The spelling of 821993370 in words is "eight hundred twenty-one million, nine hundred ninety-three thousand, three hundred seventy".