42261869 has 4 divisors (see below), whose sum is σ = 45512796. Its totient is φ = 39010944.

The previous prime is 42261853. The next prime is 42261893. The reversal of 42261869 is 96816224.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23164969 + 19096900 = 4813^2 + 4370^2 .

It is a cyclic number.

It is not a de Polignac number, because 42261869 - 2⁴ = 42261853 is a prime.

It is a super-2 number, since 2×42261869² = 3572131142746322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

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, 1625444 + ... + 1625469.

It is an arithmetic number, because the mean of its divisors is an integer number (11378199).

Almost surely, 2^42261869 is an apocalyptic number.

It is an amenable number.

42261869 is a deficient number, since it is larger than the sum of its proper divisors (3250927).

42261869 is a wasteful number, since it uses less digits than its factorization.

42261869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3250926.

The product of its digits is 41472, while the sum is 38.

The square root of 42261869 is about 6500.9129358883. The cubic root of 42261869 is about 348.3235996659.

The spelling of 42261869 in words is "forty-two million, two hundred sixty-one thousand, eight hundred sixty-nine".