42953821 has 4 divisors (see below), whose sum is σ = 43658044. Its totient is φ = 42249600.

The previous prime is 42953809. The next prime is 42953837. The reversal of 42953821 is 12835924.

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 4687225 + 38266596 = 2165^2 + 6186^2 .

It is a cyclic number.

It is not a de Polignac number, because 42953821 - 2⁵ = 42953789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42957821) 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, 352020 + ... + 352141.

It is an arithmetic number, because the mean of its divisors is an integer number (10914511).

Almost surely, 2^42953821 is an apocalyptic number.

It is an amenable number.

42953821 is a deficient number, since it is larger than the sum of its proper divisors (704223).

42953821 is an equidigital number, since it uses as much as digits as its factorization.

42953821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704222.

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

The square root of 42953821 is about 6553.9164626962. The cubic root of 42953821 is about 350.2143476136.

The spelling of 42953821 in words is "forty-two million, nine hundred fifty-three thousand, eight hundred twenty-one".