40839539 has 4 divisors (see below), whose sum is σ = 43981056. Its totient is φ = 37698024.

The previous prime is 40839509. The next prime is 40839553. The reversal of 40839539 is 93593804.

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

It is a de Polignac number, because none of the positive numbers 2^k-40839539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40839496 and 40839505.

It is not an unprimeable number, because it can be changed into a prime (40839509) 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, 1570739 + ... + 1570764.

It is an arithmetic number, because the mean of its divisors is an integer number (10995264).

Almost surely, 2^40839539 is an apocalyptic number.

40839539 is a deficient number, since it is larger than the sum of its proper divisors (3141517).

40839539 is a wasteful number, since it uses less digits than its factorization.

40839539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3141516.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 40839539 is about 6390.5820548679. The cubic root of 40839539 is about 344.3712949493.

The spelling of 40839539 in words is "forty million, eight hundred thirty-nine thousand, five hundred thirty-nine".