42820537 has 2 divisors, whose sum is σ = 42820538. Its totient is φ = 42820536.

The previous prime is 42820513. The next prime is 42820567. The reversal of 42820537 is 73502824.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42198016 + 622521 = 6496^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 42820537 - 2⁷ = 42820409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42820499 and 42820508.

It is not a weakly prime, because it can be changed into another prime (42820567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21410268 + 21410269.

It is an arithmetic number, because the mean of its divisors is an integer number (21410269).

Almost surely, 2^42820537 is an apocalyptic number.

It is an amenable number.

42820537 is a deficient number, since it is larger than the sum of its proper divisors (1).

42820537 is an equidigital number, since it uses as much as digits as its factorization.

42820537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 42820537 is about 6543.7402913013. The cubic root of 42820537 is about 349.8517385653.

The spelling of 42820537 in words is "forty-two million, eight hundred twenty thousand, five hundred thirty-seven".