42820531 has 8 divisors (see below), whose sum is σ = 46165280. Its totient is φ = 39483072.

The previous prime is 42820513. The next prime is 42820537. The reversal of 42820531 is 13502824.

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

It is a cyclic number.

It is not a de Polignac number, because 42820531 - 2⁷ = 42820403 is a prime.

It is a super-2 number, since 2×42820531² = 3667195750243922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42820496 and 42820505.

It is not an unprimeable number, because it can be changed into a prime (42820537) 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, 21850 + ... + 23728.

It is an arithmetic number, because the mean of its divisors is an integer number (5770660).

Almost surely, 2^42820531 is an apocalyptic number.

42820531 is a deficient number, since it is larger than the sum of its proper divisors (3344749).

42820531 is a wasteful number, since it uses less digits than its factorization.

42820531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3645.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 42820531 is about 6543.7398328479. The cubic root of 42820531 is about 349.8517222249.

The spelling of 42820531 in words is "forty-two million, eight hundred twenty thousand, five hundred thirty-one".