6240721 has 8 divisors (see below), whose sum is σ = 6592320. Its totient is φ = 5891472.

The previous prime is 6240701. The next prime is 6240737. The reversal of 6240721 is 1270426.

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 6240721 - 2¹⁹ = 5716433 is a prime.

It is a Duffinian number.

6240721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 6240692 and 6240701.

It is not an unprimeable number, because it can be changed into a prime (6240701) 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, 9231 + ... + 9883.

It is an arithmetic number, because the mean of its divisors is an integer number (824040).

Almost surely, 2^6240721 is an apocalyptic number.

It is an amenable number.

6240721 is a deficient number, since it is larger than the sum of its proper divisors (351599).

6240721 is a wasteful number, since it uses less digits than its factorization.

6240721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 6240721 is about 2498.1435106895. The cubic root of 6240721 is about 184.1103721073.

The spelling of 6240721 in words is "six million, two hundred forty thousand, seven hundred twenty-one".