10405665 has 20 divisors (see below), whose sum is σ = 18653844. Its totient is φ = 5549472.

The previous prime is 10405663. The next prime is 10405667. The reversal of 10405665 is 56650401.

It is a happy number.

10405665 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (10405663) and next prime (10405667).

It can be written as a sum of positive squares in 2 ways, for example, as 6765201 + 3640464 = 2601^2 + 1908^2 .

It is not a de Polignac number, because 10405665 - 2¹ = 10405663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (10405663) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12442 + ... + 13251.

Almost surely, 2^10405665 is an apocalyptic number.

10405665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10405665 is a deficient number, since it is larger than the sum of its proper divisors (8248179).

10405665 is an equidigital number, since it uses as much as digits as its factorization.

10405665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25710 (or 25701 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 10405665 is about 3225.7813007084. The cubic root of 10405665 is about 218.3182023713.

The spelling of 10405665 in words is "ten million, four hundred five thousand, six hundred sixty-five".