492145821 has 8 divisors (see below), whose sum is σ = 729104960. Its totient is φ = 328097196.

The previous prime is 492145811. The next prime is 492145853. The reversal of 492145821 is 128541294.

492145821 is a `hidden beast` number, since 492 + 145 + 8 + 21 = 666.

It is not a de Polignac number, because 492145821 - 2⁹ = 492145309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (492145811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9113785 + ... + 9113838.

It is an arithmetic number, because the mean of its divisors is an integer number (91138120).

Almost surely, 2^492145821 is an apocalyptic number.

It is an amenable number.

492145821 is a deficient number, since it is larger than the sum of its proper divisors (236959139).

492145821 is a wasteful number, since it uses less digits than its factorization.

492145821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18227632 (or 18227626 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 492145821 is about 22184.3598284918. The cubic root of 492145821 is about 789.5226625550.

The spelling of 492145821 in words is "four hundred ninety-two million, one hundred forty-five thousand, eight hundred twenty-one".