725655309 has 8 divisors (see below), whose sum is σ = 967694112. Its totient is φ = 483693360.

The previous prime is 725655289. The next prime is 725655311. The reversal of 725655309 is 903556527.

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

It is not a de Polignac number, because 725655309 - 2¹¹ = 725653261 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725655349) 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, 8554 + ... + 39044.

It is an arithmetic number, because the mean of its divisors is an integer number (120961764).

Almost surely, 2^725655309 is an apocalyptic number.

It is an amenable number.

725655309 is a deficient number, since it is larger than the sum of its proper divisors (242038803).

725655309 is a wasteful number, since it uses less digits than its factorization.

725655309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38427.

The product of its (nonzero) digits is 283500, while the sum is 42.

The square root of 725655309 is about 26937.9900697881. The cubic root of 725655309 is about 898.6214735451.

The spelling of 725655309 in words is "seven hundred twenty-five million, six hundred fifty-five thousand, three hundred nine".