40428139 has 4 divisors (see below), whose sum is σ = 40441024. Its totient is φ = 40415256.

The previous prime is 40428137. The next prime is 40428163. The reversal of 40428139 is 93182404.

40428139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40428139 - 2¹ = 40428137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40428139.

It is not an unprimeable number, because it can be changed into a prime (40428133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1669 + ... + 9145.

It is an arithmetic number, because the mean of its divisors is an integer number (10110256).

Almost surely, 2^40428139 is an apocalyptic number.

40428139 is a deficient number, since it is larger than the sum of its proper divisors (12885).

40428139 is an equidigital number, since it uses as much as digits as its factorization.

40428139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12884.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 40428139 is about 6358.3125906171. The cubic root of 40428139 is about 343.2110406402.

The spelling of 40428139 in words is "forty million, four hundred twenty-eight thousand, one hundred thirty-nine".