8721407 has 4 divisors (see below), whose sum is σ = 8735040. Its totient is φ = 8707776.

The previous prime is 8721403. The next prime is 8721413. The reversal of 8721407 is 7041278.

8721407 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8721407 - 2² = 8721403 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 8721407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721403) 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, 5807 + ... + 7152.

It is an arithmetic number, because the mean of its divisors is an integer number (2183760).

Almost surely, 2^8721407 is an apocalyptic number.

8721407 is a deficient number, since it is larger than the sum of its proper divisors (13633).

8721407 is a wasteful number, since it uses less digits than its factorization.

8721407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13632.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 8721407 is about 2953.2028375985. The cubic root of 8721407 is about 205.8395630817.

The spelling of 8721407 in words is "eight million, seven hundred twenty-one thousand, four hundred seven".