15991794 has 72 divisors (see below), whose sum is σ = 42936192. Its totient is φ = 4212000.

The previous prime is 15991793. The next prime is 15991817. The reversal of 15991794 is 49719951.

15991794 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (15991793) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20919 + ... + 21669.

It is an arithmetic number, because the mean of its divisors is an integer number (596336).

Almost surely, 2^15991794 is an apocalyptic number.

15991794 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 15991794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21468096).

15991794 is an abundant number, since it is smaller than the sum of its proper divisors (26944398).

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

15991794 is a wasteful number, since it uses less digits than its factorization.

15991794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 776 counting only the distinct ones).

The product of its digits is 102060, while the sum is 45.

The square root of 15991794 is about 3998.9741184459. The cubic root of 15991794 is about 251.9411238116.

The spelling of 15991794 in words is "fifteen million, nine hundred ninety-one thousand, seven hundred ninety-four".