15983940 has 96 divisors (see below), whose sum is σ = 53867520. Its totient is φ = 3459456.

The previous prime is 15983939. The next prime is 15983969. The reversal of 15983940 is 4938951.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 6979 + ... + 8981.

It is an arithmetic number, because the mean of its divisors is an integer number (561120).

Almost surely, 2^15983940 is an apocalyptic number.

15983940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15983940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26933760).

15983940 is an abundant number, since it is smaller than the sum of its proper divisors (37883580).

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

15983940 is a wasteful number, since it uses less digits than its factorization.

15983940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041 (or 2039 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 15983940 is about 3997.9919959900. The cubic root of 15983940 is about 251.8998720377.

The spelling of 15983940 in words is "fifteen million, nine hundred eighty-three thousand, nine hundred forty".