725434809 has 12 divisors (see below), whose sum is σ = 1063172208. Its totient is φ = 439657240.

The previous prime is 725434781. The next prime is 725434841. The reversal of 725434809 is 908434527.

It is not a de Polignac number, because 725434809 - 2¹¹ = 725432761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (725434889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 998859 + ... + 999584.

It is an arithmetic number, because the mean of its divisors is an integer number (88597684).

Almost surely, 2^725434809 is an apocalyptic number.

It is an amenable number.

725434809 is a deficient number, since it is larger than the sum of its proper divisors (337737399).

725434809 is a wasteful number, since it uses less digits than its factorization.

725434809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998468 (or 1998457 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 725434809 is about 26933.8970258669. The cubic root of 725434809 is about 898.5304449692.

It can be divided in two parts, 725 and 434809, that added together give a palindrome (435534).

The spelling of 725434809 in words is "seven hundred twenty-five million, four hundred thirty-four thousand, eight hundred nine".