942257821 has 16 divisors (see below), whose sum is σ = 985264560. Its totient is φ = 900014080.

The previous prime is 942257809. The next prime is 942257843. The reversal of 942257821 is 128752249.

It can be written as a sum of positive squares in 8 ways, for example, as 448973721 + 493284100 = 21189^2 + 22210^2 .

It is a cyclic number.

It is not a de Polignac number, because 942257821 - 2¹³ = 942249629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (942257021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1469661 + ... + 1470301.

It is an arithmetic number, because the mean of its divisors is an integer number (61579035).

Almost surely, 2^942257821 is an apocalyptic number.

It is an amenable number.

942257821 is a deficient number, since it is larger than the sum of its proper divisors (43006739).

942257821 is a wasteful number, since it uses less digits than its factorization.

942257821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136.

The product of its digits is 80640, while the sum is 40.

The square root of 942257821 is about 30696.2183501486. The cubic root of 942257821 is about 980.3697830540.

The spelling of 942257821 in words is "nine hundred forty-two million, two hundred fifty-seven thousand, eight hundred twenty-one".