42939613 has 2 divisors, whose sum is σ = 42939614. Its totient is φ = 42939612.

The previous prime is 42939607. The next prime is 42939653. The reversal of 42939613 is 31693924.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41306329 + 1633284 = 6427^2 + 1278^2 .

It is a cyclic number.

It is not a de Polignac number, because 42939613 - 2⁹ = 42939101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42939653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21469806 + 21469807.

It is an arithmetic number, because the mean of its divisors is an integer number (21469807).

Almost surely, 2^42939613 is an apocalyptic number.

It is an amenable number.

42939613 is a deficient number, since it is larger than the sum of its proper divisors (1).

42939613 is an equidigital number, since it uses as much as digits as its factorization.

42939613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 37.

The square root of 42939613 is about 6552.8324410136. The cubic root of 42939613 is about 350.1757294413.

The spelling of 42939613 in words is "forty-two million, nine hundred thirty-nine thousand, six hundred thirteen".