42261839 has 4 divisors (see below), whose sum is σ = 42379920. Its totient is φ = 42143760.

The previous prime is 42261811. The next prime is 42261853. The reversal of 42261839 is 93816224.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42261839 - 2¹⁶ = 42196303 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42261799 and 42261808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42261899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58502 + ... + 59219.

It is an arithmetic number, because the mean of its divisors is an integer number (10594980).

Almost surely, 2^42261839 is an apocalyptic number.

42261839 is a deficient number, since it is larger than the sum of its proper divisors (118081).

42261839 is a wasteful number, since it uses less digits than its factorization.

42261839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118080.

The product of its digits is 20736, while the sum is 35.

The square root of 42261839 is about 6500.9106285197. The cubic root of 42261839 is about 348.3235172456.

The spelling of 42261839 in words is "forty-two million, two hundred sixty-one thousand, eight hundred thirty-nine".