821374818 has 32 divisors (see below), whose sum is σ = 1797456960. Its totient is φ = 248156160.

The previous prime is 821374793. The next prime is 821374831. The reversal of 821374818 is 818473128.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 821374818.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3778 + ... + 40706.

It is an arithmetic number, because the mean of its divisors is an integer number (56170530).

Almost surely, 2^821374818 is an apocalyptic number.

821374818 is an abundant number, since it is smaller than the sum of its proper divisors (976082142).

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

821374818 is a wasteful number, since it uses less digits than its factorization.

821374818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37282.

The product of its digits is 86016, while the sum is 42.

The square root of 821374818 is about 28659.6374366460. The cubic root of 821374818 is about 936.5129662289.

The spelling of 821374818 in words is "eight hundred twenty-one million, three hundred seventy-four thousand, eight hundred eighteen".