15985441 has 6 divisors (see below), whose sum is σ = 16871442. Its totient is φ = 15143760.

The previous prime is 15985433. The next prime is 15985447. The reversal of 15985441 is 14458951.

15985441 = T₃₂₆₃ + T₃₂₆₄ + T₃₂₆₅.

It can be written as a sum of positive squares in only one way, i.e., 11696400 + 4289041 = 3420^2 + 2071^2 .

It is not a de Polignac number, because 15985441 - 2³ = 15985433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15985441.

It is not an unprimeable number, because it can be changed into a prime (15985447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21780 + ... + 22501.

It is an arithmetic number, because the mean of its divisors is an integer number (2811907).

Almost surely, 2^15985441 is an apocalyptic number.

15985441 is the 3265-th centered triangular number.

It is an amenable number.

15985441 is a deficient number, since it is larger than the sum of its proper divisors (886001).

15985441 is an equidigital number, since it uses as much as digits as its factorization.

15985441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44319 (or 44300 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 15985441 is about 3998.1797108184. The cubic root of 15985441 is about 251.9077568244.

It can be divided in two parts, 159854 and 41, that added together give a triangular number (159895 = T₅₆₅).

The spelling of 15985441 in words is "fifteen million, nine hundred eighty-five thousand, four hundred forty-one".