2171994 has 16 divisors (see below), whose sum is σ = 4739040. Its totient is φ = 658160.

The previous prime is 2171989. The next prime is 2171999. The reversal of 2171994 is 4991712.

It is an interprime number because it is at equal distance from previous prime (2171989) and next prime (2171999).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (2171999) 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, 16389 + ... + 16520.

It is an arithmetic number, because the mean of its divisors is an integer number (296190).

2^2171994 is an apocalyptic number.

2171994 is an abundant number, since it is smaller than the sum of its proper divisors (2567046).

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

2171994 is a wasteful number, since it uses less digits than its factorization.

2171994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32925.

The product of its digits is 4536, while the sum is 33.

The square root of 2171994 is about 1473.7686385590. The cubic root of 2171994 is about 129.5049018483.

It can be divided in two parts, 217 and 1994, that added together give a triangular number (2211 = T₆₆).

The spelling of 2171994 in words is "two million, one hundred seventy-one thousand, nine hundred ninety-four".