15985641 has 16 divisors (see below), whose sum is σ = 25200000. Its totient is φ = 8819328.

The previous prime is 15985639. The next prime is 15985643. The reversal of 15985641 is 14658951.

It is an interprime number because it is at equal distance from previous prime (15985639) and next prime (15985643).

It is not a de Polignac number, because 15985641 - 2¹ = 15985639 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 15985641.

It is not an unprimeable number, because it can be changed into a prime (15985643) 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 15 ways as a sum of consecutive naturals, for example, 12516 + ... + 13733.

It is an arithmetic number, because the mean of its divisors is an integer number (1575000).

Almost surely, 2^15985641 is an apocalyptic number.

It is an amenable number.

15985641 is a deficient number, since it is larger than the sum of its proper divisors (9214359).

15985641 is a wasteful number, since it uses less digits than its factorization.

15985641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26288.

The product of its digits is 43200, while the sum is 39.

The square root of 15985641 is about 3998.2047221222. The cubic root of 15985641 is about 251.9088073916.

The spelling of 15985641 in words is "fifteen million, nine hundred eighty-five thousand, six hundred forty-one".