10440721 has 8 divisors (see below), whose sum is σ = 10727424. Its totient is φ = 10156800.

The previous prime is 10440641. The next prime is 10440743. The reversal of 10440721 is 12704401.

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

It is a cyclic number.

It is not a de Polignac number, because 10440721 - 2¹⁹ = 9916433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10450721) 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, 8496 + ... + 9646.

It is an arithmetic number, because the mean of its divisors is an integer number (1340928).

Almost surely, 2^10440721 is an apocalyptic number.

It is an amenable number.

10440721 is a deficient number, since it is larger than the sum of its proper divisors (286703).

10440721 is a wasteful number, since it uses less digits than its factorization.

10440721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 10440721 is about 3231.2104543035. The cubic root of 10440721 is about 218.5630941168.

The spelling of 10440721 in words is "ten million, four hundred forty thousand, seven hundred twenty-one".