16091904 has 72 divisors (see below), whose sum is σ = 44739072. Its totient is φ = 5125120.

The previous prime is 16091899. The next prime is 16091923. The reversal of 16091904 is 40919061.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17209 + ... + 18119.

It is an arithmetic number, because the mean of its divisors is an integer number (621376).

Almost surely, 2^16091904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16091904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22369536).

16091904 is an abundant number, since it is smaller than the sum of its proper divisors (28647168).

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

16091904 is an equidigital number, since it uses as much as digits as its factorization.

16091904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 16091904 is about 4011.4715504413. The cubic root of 16091904 is about 252.4657549218.

The spelling of 16091904 in words is "sixteen million, ninety-one thousand, nine hundred four".