15985000 has 80 divisors (see below), whose sum is σ = 39362400. Its totient is φ = 6072000.

The previous prime is 15984979. The next prime is 15985019. The reversal of 15985000 is 58951.

It is a self number, because there is not a number n which added to its sum of digits gives 15985000.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 114931 + ... + 115069.

It is an arithmetic number, because the mean of its divisors is an integer number (492030).

Almost surely, 2^15985000 is an apocalyptic number.

15985000 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 15985000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19681200).

15985000 is an abundant number, since it is smaller than the sum of its proper divisors (23377400).

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

15985000 is a wasteful number, since it uses less digits than its factorization.

15985000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 15985000 is about 3998.1245603408. The cubic root of 15985000 is about 251.9054402927.

The spelling of 15985000 in words is "fifteen million, nine hundred eighty-five thousand".