16400172 has 36 divisors (see below), whose sum is σ = 40659080. Its totient is φ = 5144064.

The previous prime is 16400143. The next prime is 16400183. The reversal of 16400172 is 27100461.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1104 + ... + 5832.

Almost surely, 2^16400172 is an apocalyptic number.

16400172 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 16400172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20329540).

16400172 is an abundant number, since it is smaller than the sum of its proper divisors (24258908).

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

16400172 is a wasteful number, since it uses less digits than its factorization.

16400172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4770 (or 4751 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 16400172 is about 4049.7125823940. The cubic root of 16400172 is about 254.0677067525.

The spelling of 16400172 in words is "sixteen million, four hundred thousand, one hundred seventy-two".