725579409 has 8 divisors (see below), whose sum is σ = 968188032. Its totient is φ = 483345200.

The previous prime is 725579347. The next prime is 725579411. The reversal of 725579409 is 904975527.

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 725579409 - 2¹⁵ = 725546641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (725579209) 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, 89049 + ... + 96854.

It is an arithmetic number, because the mean of its divisors is an integer number (121023504).

Almost surely, 2^725579409 is an apocalyptic number.

It is an amenable number.

725579409 is a deficient number, since it is larger than the sum of its proper divisors (242608623).

725579409 is a wasteful number, since it uses less digits than its factorization.

725579409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187207.

The product of its (nonzero) digits is 793800, while the sum is 48.

The square root of 725579409 is about 26936.5812418725. The cubic root of 725579409 is about 898.5901419808.

The spelling of 725579409 in words is "seven hundred twenty-five million, five hundred seventy-nine thousand, four hundred nine".