16400272 has 40 divisors (see below), whose sum is σ = 36632576. Its totient is φ = 6967296.

The previous prime is 16400269. The next prime is 16400273. The reversal of 16400272 is 27200461.

It is not an unprimeable number, because it can be changed into a prime (16400273) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13648 + ... + 14800.

Almost surely, 2^16400272 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 16400272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18316288).

16400272 is an abundant number, since it is smaller than the sum of its proper divisors (20232304).

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

16400272 is a wasteful number, since it uses less digits than its factorization.

16400272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295 (or 1289 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 16400272 is about 4049.7249289304. The cubic root of 16400272 is about 254.0682231438.

The spelling of 16400272 in words is "sixteen million, four hundred thousand, two hundred seventy-two".