1666872 has 32 divisors (see below), whose sum is σ = 4630800. Its totient is φ = 555552.

The previous prime is 1666871. The next prime is 1666897. The reversal of 1666872 is 2786661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666871) 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, 3643 + ... + 4074.

2^1666872 is an apocalyptic number.

1666872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1666872 is an abundant number, since it is smaller than the sum of its proper divisors (2963928).

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

1666872 is a wasteful number, since it uses less digits than its factorization.

1666872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7732 (or 7722 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 1666872 is about 1291.0739715446. The cubic root of 1666872 is about 118.5679789415.

The spelling of 1666872 in words is "one million, six hundred sixty-six thousand, eight hundred seventy-two".