42039985 has 16 divisors (see below), whose sum is σ = 54467280. Its totient is φ = 30965760.

The previous prime is 42039967. The next prime is 42040007. The reversal of 42039985 is 58993024.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 720801 + 41319184 = 849^2 + 6428^2 .

It is not a de Polignac number, because 42039985 - 2⁵ = 42039953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41161 + ... + 42169.

It is an arithmetic number, because the mean of its divisors is an integer number (3404205).

Almost surely, 2^42039985 is an apocalyptic number.

It is an amenable number.

42039985 is a deficient number, since it is larger than the sum of its proper divisors (12427295).

42039985 is a wasteful number, since it uses less digits than its factorization.

42039985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 42039985 is about 6483.8248742544. The cubic root of 42039985 is about 347.7129381726.

The spelling of 42039985 in words is "forty-two million, thirty-nine thousand, nine hundred eighty-five".