2169972 has 72 divisors (see below), whose sum is σ = 6406400. Its totient is φ = 606528.

The previous prime is 2169967. The next prime is 2169991. The reversal of 2169972 is 2799612.

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

It is a nude number because it is divisible by every one of its digits.

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, 19854 + ... + 19962.

2^2169972 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 2169972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3203200).

2169972 is an abundant number, since it is smaller than the sum of its proper divisors (4236428).

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

2169972 is a wasteful number, since it uses less digits than its factorization.

2169972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205 (or 200 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 2169972 is about 1473.0824824157. The cubic root of 2169972 is about 129.4647021958.

The spelling of 2169972 in words is "two million, one hundred sixty-nine thousand, nine hundred seventy-two".