542785821 has 8 divisors (see below), whose sum is σ = 723949920. Its totient is φ = 361739472.

The previous prime is 542785811. The next prime is 542785823. The reversal of 542785821 is 128587245.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 542785821 - 2¹³ = 542777629 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (542785823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18051 + ... + 37568.

It is an arithmetic number, because the mean of its divisors is an integer number (90493740).

Almost surely, 2^542785821 is an apocalyptic number.

It is an amenable number.

542785821 is a deficient number, since it is larger than the sum of its proper divisors (181164099).

542785821 is a wasteful number, since it uses less digits than its factorization.

542785821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58875.

The product of its digits is 179200, while the sum is 42.

The square root of 542785821 is about 23297.7642918800. The cubic root of 542785821 is about 815.7232322021.

The spelling of 542785821 in words is "five hundred forty-two million, seven hundred eighty-five thousand, eight hundred twenty-one".