8240435821 has 8 divisors (see below), whose sum is σ = 8325273600. Its totient is φ = 8156026032.

The previous prime is 8240435807. The next prime is 8240435851. The reversal of 8240435821 is 1285340428.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8240435821 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 (8240435851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68221 + ... + 145378.

It is an arithmetic number, because the mean of its divisors is an integer number (1040659200).

Almost surely, 2^8240435821 is an apocalyptic number.

It is an amenable number.

8240435821 is a deficient number, since it is larger than the sum of its proper divisors (84837779).

8240435821 is a wasteful number, since it uses less digits than its factorization.

8240435821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213995.

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 8240435821 is about 90776.8462825185. The cubic root of 8240435821 is about 2019.8388772084.

The spelling of 8240435821 in words is "eight billion, two hundred forty million, four hundred thirty-five thousand, eight hundred twenty-one".