2172620 has 12 divisors (see below), whose sum is σ = 4562544. Its totient is φ = 869040.

The previous prime is 2172619. The next prime is 2172641. The reversal of 2172620 is 262712.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 108631 = 2172620 / (2 + 1 + 7 + 2 + 6 + 2 + 0).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2172592 and 2172601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54296 + ... + 54335.

It is an arithmetic number, because the mean of its divisors is an integer number (380212).

2^2172620 is an apocalyptic number.

2172620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2172620 is an abundant number, since it is smaller than the sum of its proper divisors (2389924).

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

2172620 is a wasteful number, since it uses less digits than its factorization.

2172620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108640 (or 108638 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 2172620 is about 1473.9810039482. The cubic root of 2172620 is about 129.5173423801.

The spelling of 2172620 in words is "two million, one hundred seventy-two thousand, six hundred twenty".