15730240 has 28 divisors (see below), whose sum is σ = 37458396. Its totient is φ = 6291968.

The previous prime is 15730171. The next prime is 15730249. The reversal of 15730240 is 4203751.

It can be written as a sum of positive squares in 2 ways, for example, as 7573504 + 8156736 = 2752^2 + 2856^2 .

It is not an unprimeable number, because it can be changed into a prime (15730249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24259 + ... + 24898.

Almost surely, 2^15730240 is an apocalyptic number.

15730240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15730240 is an abundant number, since it is smaller than the sum of its proper divisors (21728156).

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

15730240 is an equidigital number, since it uses as much as digits as its factorization.

15730240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49174 (or 49164 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 15730240 is about 3966.1366592693. The cubic root of 15730240 is about 250.5600245533.

Adding to 15730240 its reverse (4203751), we get a palindrome (19933991).

The spelling of 15730240 in words is "fifteen million, seven hundred thirty thousand, two hundred forty".