725437309 has 16 divisors (see below), whose sum is σ = 774792000. Its totient is φ = 677255040.

The previous prime is 725437303. The next prime is 725437327. The reversal of 725437309 is 903734527.

It is a cyclic number.

It is not a de Polignac number, because 725437309 - 2³ = 725437301 is a prime.

It is a super-2 number, since 2×725437309² = 1052518578578322962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725437301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 711402 + ... + 712420.

It is an arithmetic number, because the mean of its divisors is an integer number (48424500).

Almost surely, 2^725437309 is an apocalyptic number.

It is an amenable number.

725437309 is a deficient number, since it is larger than the sum of its proper divisors (49354691).

725437309 is a wasteful number, since it uses less digits than its factorization.

725437309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548.

The product of its (nonzero) digits is 158760, while the sum is 40.

The square root of 725437309 is about 26933.9434357466. The cubic root of 725437309 is about 898.5314771426.

The spelling of 725437309 in words is "seven hundred twenty-five million, four hundred thirty-seven thousand, three hundred nine".