42686837 has 2 divisors, whose sum is σ = 42686838. Its totient is φ = 42686836.

The previous prime is 42686821. The next prime is 42686843. The reversal of 42686837 is 73868624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42328036 + 358801 = 6506^2 + 599^2 .

It is a cyclic number.

It is not a de Polignac number, because 42686837 - 2⁴ = 42686821 is a prime.

It is a super-3 number, since 3×42686837³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42686867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21343418 + 21343419.

It is an arithmetic number, because the mean of its divisors is an integer number (21343419).

Almost surely, 2^42686837 is an apocalyptic number.

It is an amenable number.

42686837 is a deficient number, since it is larger than the sum of its proper divisors (1).

42686837 is an equidigital number, since it uses as much as digits as its factorization.

42686837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 44.

The square root of 42686837 is about 6533.5164345091. The cubic root of 42686837 is about 349.4872409985.

The spelling of 42686837 in words is "forty-two million, six hundred eighty-six thousand, eight hundred thirty-seven".