2172378 has 16 divisors (see below), whose sum is σ = 4679136. Its totient is φ = 668400.

The previous prime is 2172371. The next prime is 2172383. The reversal of 2172378 is 8732712.

It is not an unprimeable number, because it can be changed into a prime (2172371) 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, 13848 + ... + 14003.

It is an arithmetic number, because the mean of its divisors is an integer number (292446).

2^2172378 is an apocalyptic number.

2172378 is an abundant number, since it is smaller than the sum of its proper divisors (2506758).

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

2172378 is a wasteful number, since it uses less digits than its factorization.

2172378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27869.

The product of its digits is 4704, while the sum is 30.

The square root of 2172378 is about 1473.8989110519. The cubic root of 2172378 is about 129.5125333844.

The spelling of 2172378 in words is "two million, one hundred seventy-two thousand, three hundred seventy-eight".