15940040 has 32 divisors (see below), whose sum is σ = 36046080. Its totient is φ = 6343872.

The previous prime is 15940027. The next prime is 15940049. The reversal of 15940040 is 4004951.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 15939988 and 15940015.

It is not an unprimeable number, because it can be changed into a prime (15940049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8027 + ... + 9813.

It is an arithmetic number, because the mean of its divisors is an integer number (1126440).

Almost surely, 2^15940040 is an apocalyptic number.

15940040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15940040 is an abundant number, since it is smaller than the sum of its proper divisors (20106040).

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

15940040 is a wasteful number, since it uses less digits than its factorization.

15940040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021 (or 2017 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 15940040 is about 3992.4979649337. The cubic root of 15940040 is about 251.6690456821.

Adding to 15940040 its reverse (4004951), we get a palindrome (19944991).

The spelling of 15940040 in words is "fifteen million, nine hundred forty thousand, forty".