40335821 has 4 divisors (see below), whose sum is σ = 40353852. Its totient is φ = 40317792.

The previous prime is 40335793. The next prime is 40335851. The reversal of 40335821 is 12853304.

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 37576900 + 2758921 = 6130^2 + 1661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40335821 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40335851) 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, 5090 + ... + 10323.

It is an arithmetic number, because the mean of its divisors is an integer number (10088463).

Almost surely, 2^40335821 is an apocalyptic number.

It is an amenable number.

40335821 is a deficient number, since it is larger than the sum of its proper divisors (18031).

40335821 is a wasteful number, since it uses less digits than its factorization.

40335821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18030.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 40335821 is about 6351.0488110233. The cubic root of 40335821 is about 342.9495997594.

The spelling of 40335821 in words is "forty million, three hundred thirty-five thousand, eight hundred twenty-one".