1009665 has 28 divisors (see below), whose sum is σ = 1823124. Its totient is φ = 536544.

The previous prime is 1009651. The next prime is 1009669. The reversal of 1009665 is 5669001.

It can be written as a sum of positive squares in 2 ways, for example, as 263169 + 746496 = 513^2 + 864^2 .

It is not a de Polignac number, because 1009665 - 2⁴ = 1009649 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1009669) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3507 + ... + 3783.

It is a Proth number, since it is equal to 493 ⋅ 2¹¹ + 1 and 493 < 2¹¹.

2^1009665 is an apocalyptic number.

1009665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1009665 is a deficient number, since it is larger than the sum of its proper divisors (813459).

1009665 is an frugal number, since it uses more digits than its factorization.

1009665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 1009665 is about 1004.8208795601. The cubic root of 1009665 is about 100.3211342904.

The spelling of 1009665 in words is "one million, nine thousand, six hundred sixty-five".