8749621 has 4 divisors (see below), whose sum is σ = 8816544. Its totient is φ = 8682700.

The previous prime is 8749613. The next prime is 8749627. The reversal of 8749621 is 1269478.

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 8749621 - 2³ = 8749613 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8749627) 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, 33265 + ... + 33526.

It is an arithmetic number, because the mean of its divisors is an integer number (2204136).

Almost surely, 2^8749621 is an apocalyptic number.

It is an amenable number.

8749621 is a deficient number, since it is larger than the sum of its proper divisors (66923).

8749621 is a wasteful number, since it uses less digits than its factorization.

8749621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66922.

The product of its digits is 24192, while the sum is 37.

The square root of 8749621 is about 2957.9758281636. The cubic root of 8749621 is about 206.0612897720.

The spelling of 8749621 in words is "eight million, seven hundred forty-nine thousand, six hundred twenty-one".