42067639 has 12 divisors (see below), whose sum is σ = 45177264. Its totient is φ = 39035904.

The previous prime is 42067609. The next prime is 42067643. The reversal of 42067639 is 93676024.

It is not a de Polignac number, because 42067639 - 2⁹ = 42067127 is a prime.

It is a super-3 number, since 3×42067639³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42067598 and 42067607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42067609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159822 + ... + 160084.

It is an arithmetic number, because the mean of its divisors is an integer number (3764772).

Almost surely, 2^42067639 is an apocalyptic number.

42067639 is a deficient number, since it is larger than the sum of its proper divisors (3109625).

42067639 is an equidigital number, since it uses as much as digits as its factorization.

42067639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 42067639 is about 6485.9570612208. The cubic root of 42067639 is about 347.7891635880.

The spelling of 42067639 in words is "forty-two million, sixty-seven thousand, six hundred thirty-nine".