1660872 has 16 divisors (see below), whose sum is σ = 4152240. Its totient is φ = 553616.

The previous prime is 1660871. The next prime is 1660873. The reversal of 1660872 is 2780661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1660871) and next prime (1660873).

It is not an unprimeable number, because it can be changed into a prime (1660871) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 34578 + ... + 34625.

It is an arithmetic number, because the mean of its divisors is an integer number (259515).

2^1660872 is an apocalyptic number.

1660872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1660872 is an abundant number, since it is smaller than the sum of its proper divisors (2491368).

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

1660872 is a wasteful number, since it uses less digits than its factorization.

1660872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69212 (or 69208 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 1660872 is about 1288.7482298727. The cubic root of 1660872 is about 118.4255438557.

The spelling of 1660872 in words is "one million, six hundred sixty thousand, eight hundred seventy-two".