2189621 has 8 divisors (see below), whose sum is σ = 2511744. Its totient is φ = 1869840.

The previous prime is 2189609. The next prime is 2189633. The reversal of 2189621 is 1269812.

It is an interprime number because it is at equal distance from previous prime (2189609) and next prime (2189633).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2189621 is a prime.

It is a super-3 number, since 3×2189621³ = 31494020333900790183, which contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2576 + ... + 3318.

It is an arithmetic number, because the mean of its divisors is an integer number (313968).

2^2189621 is an apocalyptic number.

It is an amenable number.

2189621 is a deficient number, since it is larger than the sum of its proper divisors (322123).

2189621 is an equidigital number, since it uses as much as digits as its factorization.

2189621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171.

The product of its digits is 1728, while the sum is 29.

The square root of 2189621 is about 1479.7368009210. The cubic root of 2189621 is about 129.8542943460.

The spelling of 2189621 in words is "two million, one hundred eighty-nine thousand, six hundred twenty-one".