1664860 has 12 divisors (see below), whose sum is σ = 3496248. Its totient is φ = 665936.

The previous prime is 1664857. The next prime is 1664863. The reversal of 1664860 is 684661.

It is an interprime number because it is at equal distance from previous prime (1664857) and next prime (1664863).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664863) 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, 41602 + ... + 41641.

It is an arithmetic number, because the mean of its divisors is an integer number (291354).

2^1664860 is an apocalyptic number.

1664860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664860 is an abundant number, since it is smaller than the sum of its proper divisors (1831388).

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

1664860 is a wasteful number, since it uses less digits than its factorization.

1664860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83252 (or 83250 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1664860 is about 1290.2945400179. The cubic root of 1664860 is about 118.5202538567.

The spelling of 1664860 in words is "one million, six hundred sixty-four thousand, eight hundred sixty".