1409805 has 30 divisors (see below), whose sum is σ = 2570766. Its totient is φ = 739152.

The previous prime is 1409803. The next prime is 1409833. The reversal of 1409805 is 5089041.

It can be written as a sum of positive squares in only one way, i.e., 1127844 + 281961 = 1062^2 + 531^2 .

It is not a de Polignac number, because 1409805 - 2¹ = 1409803 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1409803) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 23866 + ... + 23924.

2^1409805 is an apocalyptic number.

1409805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1409805 is a deficient number, since it is larger than the sum of its proper divisors (1160961).

1409805 is an frugal number, since it uses more digits than its factorization.

1409805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1409805 is about 1187.3520960524. The cubic root of 1409805 is about 112.1294474808.

The spelling of 1409805 in words is "one million, four hundred nine thousand, eight hundred five".