821967402 has 16 divisors (see below), whose sum is σ = 1649224512. Its totient is φ = 273107520.

The previous prime is 821967389. The next prime is 821967413. The reversal of 821967402 is 204769128.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218383 + ... + 222114.

It is an arithmetic number, because the mean of its divisors is an integer number (103076532).

Almost surely, 2^821967402 is an apocalyptic number.

821967402 is an abundant number, since it is smaller than the sum of its proper divisors (827257110).

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

821967402 is a wasteful number, since it uses less digits than its factorization.

821967402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440813.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 821967402 is about 28669.9738751189. The cubic root of 821967402 is about 936.7381290416.

It can be divided in two parts, 82196 and 7402, that added together give a palindrome (89598).

The spelling of 821967402 in words is "eight hundred twenty-one million, nine hundred sixty-seven thousand, four hundred two".