15986140 has 12 divisors (see below), whose sum is σ = 33570936. Its totient is φ = 6394448.

The previous prime is 15986129. The next prime is 15986141. The reversal of 15986140 is 4168951.

It is a junction number, because it is equal to n+sod(n) for n = 15986096 and 15986105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15986141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 399634 + ... + 399673.

It is an arithmetic number, because the mean of its divisors is an integer number (2797578).

Almost surely, 2^15986140 is an apocalyptic number.

15986140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15986140 is an abundant number, since it is smaller than the sum of its proper divisors (17584796).

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

15986140 is a wasteful number, since it uses less digits than its factorization.

15986140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799316 (or 799314 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 15986140 is about 3998.2671246429. The cubic root of 15986140 is about 251.9114285186.

The spelling of 15986140 in words is "fifteen million, nine hundred eighty-six thousand, one hundred forty".