15998000 has 80 divisors (see below), whose sum is σ = 40815840. Its totient is φ = 6048000.

The previous prime is 15997999. The next prime is 15998009. The reversal of 15998000 is 89951.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (15998009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37790 + ... + 38210.

It is an arithmetic number, because the mean of its divisors is an integer number (510198).

Almost surely, 2^15998000 is an apocalyptic number.

15998000 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 15998000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20407920).

15998000 is an abundant number, since it is smaller than the sum of its proper divisors (24817840).

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

15998000 is a wasteful number, since it uses less digits than its factorization.

15998000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 447 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 15998000 is about 3999.7499921870. The cubic root of 15998000 is about 251.9737101994.

The spelling of 15998000 in words is "fifteen million, nine hundred ninety-eight thousand".