492442821 has 20 divisors (see below), whose sum is σ = 792212652. Its totient is φ = 303041088.

The previous prime is 492442799. The next prime is 492442877. The reversal of 492442821 is 128244294.

It can be written as a sum of positive squares in 2 ways, for example, as 21986721 + 470456100 = 4689^2 + 21690^2 .

It is not a de Polignac number, because 492442821 - 2⁹ = 492442309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (492442891) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 232776 + ... + 234881.

Almost surely, 2^492442821 is an apocalyptic number.

It is an amenable number.

492442821 is a deficient number, since it is larger than the sum of its proper divisors (299769831).

492442821 is a wasteful number, since it uses less digits than its factorization.

492442821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467682 (or 467673 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 492442821 is about 22191.0527240147. The cubic root of 492442821 is about 789.6814509107.

The spelling of 492442821 in words is "four hundred ninety-two million, four hundred forty-two thousand, eight hundred twenty-one".