725440249 has 4 divisors (see below), whose sum is σ = 750455460. Its totient is φ = 700425040.

The previous prime is 725440193. The next prime is 725440267. The reversal of 725440249 is 942044527.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 558849600 + 166590649 = 23640^2 + 12907^2 .

It is a cyclic number.

It is not a de Polignac number, because 725440249 - 2¹⁵ = 725407481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725440279) 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 3 ways as a sum of consecutive naturals, for example, 12507562 + ... + 12507619.

It is an arithmetic number, because the mean of its divisors is an integer number (187613865).

Almost surely, 2^725440249 is an apocalyptic number.

It is an amenable number.

725440249 is a deficient number, since it is larger than the sum of its proper divisors (25015211).

725440249 is a wasteful number, since it uses less digits than its factorization.

725440249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25015210.

The product of its (nonzero) digits is 80640, while the sum is 37.

The square root of 725440249 is about 26933.9980136630. The cubic root of 725440249 is about 898.5326909755.

The spelling of 725440249 in words is "seven hundred twenty-five million, four hundred forty thousand, two hundred forty-nine".