1665413 has 6 divisors (see below), whose sum is σ = 1721862. Its totient is φ = 1610760.

The previous prime is 1665343. The next prime is 1665421. The reversal of 1665413 is 3145661.

It can be written as a sum of positive squares in only one way, i.e., 1387684 + 277729 = 1178^2 + 527^2 .

It is not a de Polignac number, because 1665413 - 2¹⁶ = 1599877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665493) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 95 + ... + 1827.

It is an arithmetic number, because the mean of its divisors is an integer number (286977).

2^1665413 is an apocalyptic number.

It is an amenable number.

1665413 is a deficient number, since it is larger than the sum of its proper divisors (56449).

1665413 is an equidigital number, since it uses as much as digits as its factorization.

1665413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795 (or 1764 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 1665413 is about 1290.5088143829. The cubic root of 1665413 is about 118.5333749690.

The spelling of 1665413 in words is "one million, six hundred sixty-five thousand, four hundred thirteen".