204721842 has 16 divisors (see below), whose sum is σ = 440939520. Its totient is φ = 62991312.

The previous prime is 204721823. The next prime is 204721883. The reversal of 204721842 is 248127402.

It is a super-2 number, since 2×204721842² = 83822065183745928, which contains 22 as substring.

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, 1312242 + ... + 1312397.

It is an arithmetic number, because the mean of its divisors is an integer number (27558720).

Almost surely, 2^204721842 is an apocalyptic number.

204721842 is an abundant number, since it is smaller than the sum of its proper divisors (236217678).

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

204721842 is a wasteful number, since it uses less digits than its factorization.

204721842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624657.

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 204721842 is about 14308.1040672760. The cubic root of 204721842 is about 589.3700467694.

The spelling of 204721842 in words is "two hundred four million, seven hundred twenty-one thousand, eight hundred forty-two".