2171972 has 12 divisors (see below), whose sum is σ = 4146576. Its totient is φ = 987240.

The previous prime is 2171963. The next prime is 2171977. The reversal of 2171972 is 2791712.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2171977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24638 + ... + 24725.

It is an arithmetic number, because the mean of its divisors is an integer number (345548).

2^2171972 is an apocalyptic number.

2171972 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2171972 is a deficient number, since it is larger than the sum of its proper divisors (1974604).

2171972 is a wasteful number, since it uses less digits than its factorization.

2171972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49378 (or 49376 counting only the distinct ones).

The product of its digits is 1764, while the sum is 29.

The square root of 2171972 is about 1473.7611746820. The cubic root of 2171972 is about 129.5044645976.

The spelling of 2171972 in words is "two million, one hundred seventy-one thousand, nine hundred seventy-two".