2181465 has 64 divisors (see below), whose sum is σ = 4596480. Its totient is φ = 967680.

The previous prime is 2181463. The next prime is 2181469. The reversal of 2181465 is 5641812.

It is not a de Polignac number, because 2181465 - 2¹ = 2181463 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (2181461) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19249 + ... + 19361.

It is an arithmetic number, because the mean of its divisors is an integer number (71820).

2^2181465 is an apocalyptic number.

It is an amenable number.

2181465 is an abundant number, since it is smaller than the sum of its proper divisors (2415015).

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

2181465 is a wasteful number, since it uses less digits than its factorization.

2181465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 145 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 2181465 is about 1476.9783343028. The cubic root of 2181465 is about 129.6928646835.

The spelling of 2181465 in words is "two million, one hundred eighty-one thousand, four hundred sixty-five".