42841639 has 2 divisors, whose sum is σ = 42841640. Its totient is φ = 42841638.

The previous prime is 42841633. The next prime is 42841657. The reversal of 42841639 is 93614824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42841639 - 2¹¹ = 42839591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42841598 and 42841607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42841633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21420819 + 21420820.

It is an arithmetic number, because the mean of its divisors is an integer number (21420820).

Almost surely, 2^42841639 is an apocalyptic number.

42841639 is a deficient number, since it is larger than the sum of its proper divisors (1).

42841639 is an equidigital number, since it uses as much as digits as its factorization.

42841639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 37.

The square root of 42841639 is about 6545.3524733203. The cubic root of 42841639 is about 349.9091982137.

The spelling of 42841639 in words is "forty-two million, eight hundred forty-one thousand, six hundred thirty-nine".