1665361 has 8 divisors (see below), whose sum is σ = 1767744. Its totient is φ = 1565520.

The previous prime is 1665343. The next prime is 1665421. The reversal of 1665361 is 1635661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1665361 - 2⁷ = 1665233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665311) 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, 810 + ... + 1996.

It is an arithmetic number, because the mean of its divisors is an integer number (220968).

2^1665361 is an apocalyptic number.

It is an amenable number.

1665361 is a deficient number, since it is larger than the sum of its proper divisors (102383).

1665361 is a wasteful number, since it uses less digits than its factorization.

1665361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271.

The product of its digits is 3240, while the sum is 28.

The square root of 1665361 is about 1290.4886671335. The cubic root of 1665361 is about 118.5321412811.

The spelling of 1665361 in words is "one million, six hundred sixty-five thousand, three hundred sixty-one".