1665480 has 32 divisors (see below), whose sum is σ = 4996800. Its totient is φ = 444096.

The previous prime is 1665479. The next prime is 1665493. The reversal of 1665480 is 845661.

It is a super-3 number, since 3×1665480³ = 13859243339875776000, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6820 + ... + 7059.

It is an arithmetic number, because the mean of its divisors is an integer number (156150).

2^1665480 is an apocalyptic number.

1665480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665480 is an abundant number, since it is smaller than the sum of its proper divisors (3331320).

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

1665480 is a wasteful number, since it uses less digits than its factorization.

1665480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13893 (or 13889 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1665480 is about 1290.5347728752. The cubic root of 1665480 is about 118.5349644906.

It can be divided in two parts, 1665 and 480, that added together give a triangular number (2145 = T₆₅).

The spelling of 1665480 in words is "one million, six hundred sixty-five thousand, four hundred eighty".