2171604 has 48 divisors (see below), whose sum is σ = 5354048. Its totient is φ = 684288.

The previous prime is 2171599. The next prime is 2171621. The reversal of 2171604 is 4061712.

It is a nialpdrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29712 + ... + 29784.

2^2171604 is an apocalyptic number.

It is an amenable number.

2171604 is an abundant number, since it is smaller than the sum of its proper divisors (3182444).

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

2171604 is a wasteful number, since it uses less digits than its factorization.

2171604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 2171604 is about 1473.6363187707. The cubic root of 2171604 is about 129.4971501487.

It can be divided in two parts, 2171 and 604, that added together give a triangular number (2775 = T₇₄).

The spelling of 2171604 in words is "two million, one hundred seventy-one thousand, six hundred four".