2909172 has 48 divisors (see below), whose sum is σ = 7902720. Its totient is φ = 815712.

The previous prime is 2909167. The next prime is 2909177. The reversal of 2909172 is 2719092.

It is an interprime number because it is at equal distance from previous prime (2909167) and next prime (2909177).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2909177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4663 + ... + 5249.

It is an arithmetic number, because the mean of its divisors is an integer number (164640).

2^2909172 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 2909172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3951360).

2909172 is an abundant number, since it is smaller than the sum of its proper divisors (4993548).

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

2909172 is a wasteful number, since it uses less digits than its factorization.

2909172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 2909172 is about 1705.6295025591. The cubic root of 2909172 is about 142.7544975033.

It can be divided in two parts, 2909 and 172, that added together give a triangular number (3081 = T₇₈).

The spelling of 2909172 in words is "two million, nine hundred nine thousand, one hundred seventy-two".