8942747621 has 4 divisors (see below), whose sum is σ = 8952876192. Its totient is φ = 8932619052.

The previous prime is 8942747617. The next prime is 8942747647. The reversal of 8942747621 is 1267472498.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8942747621 - 2² = 8942747617 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8942747621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8942747221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5062961 + ... + 5064726.

It is an arithmetic number, because the mean of its divisors is an integer number (2238219048).

Almost surely, 2^8942747621 is an apocalyptic number.

It is an amenable number.

8942747621 is a deficient number, since it is larger than the sum of its proper divisors (10128571).

8942747621 is a wasteful number, since it uses less digits than its factorization.

8942747621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10128570.

The product of its digits is 1354752, while the sum is 50.

The square root of 8942747621 is about 94566.1018600217. The cubic root of 8942747621 is about 2075.6637056999.

The spelling of 8942747621 in words is "eight billion, nine hundred forty-two million, seven hundred forty-seven thousand, six hundred twenty-one".