16191972 has 36 divisors (see below), whose sum is σ = 41430480. Its totient is φ = 5331312.

The previous prime is 16191961. The next prime is 16191997. The reversal of 16191972 is 27919161.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 279 + ... + 5697.

Almost surely, 2^16191972 is an apocalyptic number.

16191972 is a gapful number since it is divisible by the number (12) 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 16191972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20715240).

16191972 is an abundant number, since it is smaller than the sum of its proper divisors (25238508).

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

16191972 is a wasteful number, since it uses less digits than its factorization.

16191972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512 (or 5507 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 16191972 is about 4023.9249495983. The cubic root of 16191972 is about 252.9879959101.

The spelling of 16191972 in words is "sixteen million, one hundred ninety-one thousand, nine hundred seventy-two".