15945040 has 20 divisors (see below), whose sum is σ = 37072404. Its totient is φ = 6377984.

The previous prime is 15945037. The next prime is 15945043. The reversal of 15945040 is 4054951.

15945040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (15945037) and next prime (15945043).

It can be written as a sum of positive squares in 2 ways, for example, as 8503056 + 7441984 = 2916^2 + 2728^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15945043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99577 + ... + 99736.

Almost surely, 2^15945040 is an apocalyptic number.

15945040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15945040 is an abundant number, since it is smaller than the sum of its proper divisors (21127364).

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

15945040 is a wasteful number, since it uses less digits than its factorization.

15945040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199326 (or 199320 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 15945040 is about 3993.1240902331. The cubic root of 15945040 is about 251.6953570691.

Adding to 15945040 its reverse (4054951), we get a palindrome (19999991).

The spelling of 15945040 in words is "fifteen million, nine hundred forty-five thousand, forty".