40000039 has 4 divisors (see below), whose sum is σ = 40105960. Its totient is φ = 39894120.

The previous prime is 40000033. The next prime is 40000061. The reversal of 40000039 is 93000004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40000039 - 2⁹ = 39999527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39999977 and 40000031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40000033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52392 + ... + 53149.

It is an arithmetic number, because the mean of its divisors is an integer number (10026490).

Almost surely, 2^40000039 is an apocalyptic number.

40000039 is a deficient number, since it is larger than the sum of its proper divisors (105921).

40000039 is a wasteful number, since it uses less digits than its factorization.

40000039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105920.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 40000039 is about 6324.5584035567. The cubic root of 40000039 is about 341.9953004837.

The spelling of 40000039 in words is "forty million, thirty-nine", and thus it is an aban number and an uban number.