422821557 has 6 divisors (see below), whose sum is σ = 610742262. Its totient is φ = 281881032.

The previous prime is 422821549. The next prime is 422821571. The reversal of 422821557 is 755128224.

It is a happy number.

422821557 is a `hidden beast` number, since 4 + 22 + 82 + 1 + 557 = 666.

It can be written as a sum of positive squares in only one way, i.e., 248819076 + 174002481 = 15774^2 + 13191^2 .

It is not a de Polignac number, because 422821557 - 2³ = 422821549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422821507) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23490078 + ... + 23490095.

It is an arithmetic number, because the mean of its divisors is an integer number (101790377).

Almost surely, 2^422821557 is an apocalyptic number.

It is an amenable number.

422821557 is a deficient number, since it is larger than the sum of its proper divisors (187920705).

422821557 is a wasteful number, since it uses less digits than its factorization.

422821557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46980179 (or 46980176 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 422821557 is about 20562.6252458192. The cubic root of 422821557 is about 750.5605036765.

The spelling of 422821557 in words is "four hundred twenty-two million, eight hundred twenty-one thousand, five hundred fifty-seven".