42995639 has 2 divisors, whose sum is σ = 42995640. Its totient is φ = 42995638.

The previous prime is 42995629. The next prime is 42995677. The reversal of 42995639 is 93659924.

42995639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42995639 - 2¹⁶ = 42930103 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42995593 and 42995602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42995609) 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 as a sum of consecutive naturals, namely, 21497819 + 21497820.

It is an arithmetic number, because the mean of its divisors is an integer number (21497820).

Almost surely, 2^42995639 is an apocalyptic number.

42995639 is a deficient number, since it is larger than the sum of its proper divisors (1).

42995639 is an equidigital number, since it uses as much as digits as its factorization.

42995639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 47.

The square root of 42995639 is about 6557.1059927380. The cubic root of 42995639 is about 350.3279619802.

It can be divided in two parts, 42995 and 639, that added together give a palindrome (43634).

The spelling of 42995639 in words is "forty-two million, nine hundred ninety-five thousand, six hundred thirty-nine".