1665120 has 48 divisors (see below), whose sum is σ = 5246640. Its totient is φ = 443904.

The previous prime is 1665109. The next prime is 1665121. The reversal of 1665120 is 215661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1665120² = 5545249228800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665121) 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, 1255 + ... + 2214.

It is an arithmetic number, because the mean of its divisors is an integer number (109305).

2^1665120 is an apocalyptic number.

1665120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665120 is an abundant number, since it is smaller than the sum of its proper divisors (3581520).

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

1665120 is a wasteful number, since it uses less digits than its factorization.

1665120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3487 (or 3479 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1665120 is about 1290.3952882741. The cubic root of 1665120 is about 118.5264232768.

The spelling of 1665120 in words is "one million, six hundred sixty-five thousand, one hundred twenty".