724015409 has 4 divisors (see below), whose sum is σ = 779708916. Its totient is φ = 668321904.

The previous prime is 724015399. The next prime is 724015423. The reversal of 724015409 is 904510427.

It is a happy number.

724015409 is digitally balanced in base 2, 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, and also an emirpimes, since its reverse is a distinct semiprime: 904510427 = 233 ⋅3882019.

It can be written as a sum of positive squares in 2 ways, for example, as 362064784 + 361950625 = 19028^2 + 19025^2 .

It is a cyclic number.

It is not a de Polignac number, because 724015409 - 2²⁴ = 707238193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (724015429) 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, 27846734 + ... + 27846759.

It is an arithmetic number, because the mean of its divisors is an integer number (194927229).

Almost surely, 2^724015409 is an apocalyptic number.

It is an amenable number.

724015409 is a deficient number, since it is larger than the sum of its proper divisors (55693507).

724015409 is a wasteful number, since it uses less digits than its factorization.

724015409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55693506.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 724015409 is about 26907.5344281114. The cubic root of 724015409 is about 897.9440349016.

The spelling of 724015409 in words is "seven hundred twenty-four million, fifteen thousand, four hundred nine".