725440040 has 32 divisors (see below), whose sum is σ = 1757798280. Its totient is φ = 267854592.

The previous prime is 725440013. The next prime is 725440043. The reversal of 725440040 is 40044527.

725440040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 342768196 + 382671844 = 18514^2 + 19562^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 725439991 and 725440009.

It is not an unprimeable number, because it can be changed into a prime (725440043) 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, 697019 + ... + 698058.

Almost surely, 2^725440040 is an apocalyptic number.

It is an amenable number.

725440040 is an abundant number, since it is smaller than the sum of its proper divisors (1032358240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

725440040 is a wasteful number, since it uses less digits than its factorization.

725440040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395101 (or 1395097 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 725440040 is about 26933.9941338079. The cubic root of 725440040 is about 898.5326046862.

Adding to 725440040 its reverse (40044527), we get a palindrome (765484567).

The spelling of 725440040 in words is "seven hundred twenty-five million, four hundred forty thousand, forty".