2172690 has 64 divisors (see below), whose sum is σ = 6249600. Its totient is φ = 533952.

The previous prime is 2172679. The next prime is 2172701. The reversal of 2172690 is 962712.

It is an interprime number because it is at equal distance from previous prime (2172679) and next prime (2172701).

It is a super-2 number, since 2×2172690² = 9441163672200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3201 + ... + 3819.

It is an arithmetic number, because the mean of its divisors is an integer number (97650).

2^2172690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2172690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3124800).

2172690 is an abundant number, since it is smaller than the sum of its proper divisors (4076910).

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

2172690 is a wasteful number, since it uses less digits than its factorization.

2172690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 2172690 is about 1474.0047489747. The cubic root of 2172690 is about 129.5187333453.

The spelling of 2172690 in words is "two million, one hundred seventy-two thousand, six hundred ninety".