42835921 has 4 divisors (see below), whose sum is σ = 42988644. Its totient is φ = 42683200.

The previous prime is 42835909. The next prime is 42835931. The reversal of 42835921 is 12953824.

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 13242321 + 29593600 = 3639^2 + 5440^2 .

It is a cyclic number.

It is not a de Polignac number, because 42835921 - 2²¹ = 40738769 is a prime.

It is a super-2 number, since 2×42835921² = 3669832255836482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42835901) 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, 75940 + ... + 76501.

It is an arithmetic number, because the mean of its divisors is an integer number (10747161).

Almost surely, 2^42835921 is an apocalyptic number.

It is an amenable number.

42835921 is a deficient number, since it is larger than the sum of its proper divisors (152723).

42835921 is a wasteful number, since it uses less digits than its factorization.

42835921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152722.

The product of its digits is 17280, while the sum is 34.

The square root of 42835921 is about 6544.9156602664. The cubic root of 42835921 is about 349.8936302611.

The spelling of 42835921 in words is "forty-two million, eight hundred thirty-five thousand, nine hundred twenty-one".