2171390 has 16 divisors (see below), whose sum is σ = 4209408. Its totient is φ = 801696.

The previous prime is 2171387. The next prime is 2171431. The reversal of 2171390 is 931712.

2171390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8222 + ... + 8481.

It is an arithmetic number, because the mean of its divisors is an integer number (263088).

2^2171390 is an apocalyptic number.

2171390 is a deficient number, since it is larger than the sum of its proper divisors (2038018).

2171390 is a wasteful number, since it uses less digits than its factorization.

2171390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16723.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 2171390 is about 1473.5637074793. The cubic root of 2171390 is about 129.4928962577.

The spelling of 2171390 in words is "two million, one hundred seventy-one thousand, three hundred ninety".