42405139 has 12 divisors (see below), whose sum is σ = 50380704. Its totient is φ = 35571984.

The previous prime is 42405137. The next prime is 42405149. The reversal of 42405139 is 93150424.

It is not a de Polignac number, because 42405139 - 2¹ = 42405137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42405137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6904 + ... + 11509.

It is an arithmetic number, because the mean of its divisors is an integer number (4198392).

Almost surely, 2^42405139 is an apocalyptic number.

42405139 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

42405139 is a deficient number, since it is larger than the sum of its proper divisors (7975565).

42405139 is a wasteful number, since it uses less digits than its factorization.

42405139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18474 (or 18467 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 42405139 is about 6511.9228343094. The cubic root of 42405139 is about 348.7167676011.

The spelling of 42405139 in words is "forty-two million, four hundred five thousand, one hundred thirty-nine".