8940721 has 4 divisors (see below), whose sum is σ = 9329472. Its totient is φ = 8551972.

The previous prime is 8940719. The next prime is 8940727. The reversal of 8940721 is 1270498.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1270498 = 2 ⋅635249.

It is a cyclic number.

It is not a de Polignac number, because 8940721 - 2¹ = 8940719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8940727) 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, 194341 + ... + 194386.

It is an arithmetic number, because the mean of its divisors is an integer number (2332368).

Almost surely, 2^8940721 is an apocalyptic number.

It is an amenable number.

8940721 is a deficient number, since it is larger than the sum of its proper divisors (388751).

8940721 is a wasteful number, since it uses less digits than its factorization.

8940721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388750.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 8940721 is about 2990.1038443506. The cubic root of 8940721 is about 207.5506897016.

The spelling of 8940721 in words is "eight million, nine hundred forty thousand, seven hundred twenty-one".