16397172 has 72 divisors (see below), whose sum is σ = 46230912. Its totient is φ = 4857600.

The previous prime is 16397167. The next prime is 16397189. The reversal of 16397172 is 27179361.

It is a happy number.

16397172 is a `hidden beast` number, since 1 + 639 + 7 + 17 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18172 + ... + 19052.

It is an arithmetic number, because the mean of its divisors is an integer number (642096).

Almost surely, 2^16397172 is an apocalyptic number.

16397172 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 16397172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23115456).

16397172 is an abundant number, since it is smaller than the sum of its proper divisors (29833740).

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

16397172 is a wasteful number, since it uses less digits than its factorization.

16397172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 949 (or 944 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 16397172 is about 4049.3421687973. The cubic root of 16397172 is about 254.0522140369.

The spelling of 16397172 in words is "sixteen million, three hundred ninety-seven thousand, one hundred seventy-two".