1240209 has 12 divisors (see below), whose sum is σ = 1835652. Its totient is φ = 806400.

The previous prime is 1240207. The next prime is 1240219. The reversal of 1240209 is 9020421.

It can be written as a sum of positive squares in 2 ways, for example, as 435600 + 804609 = 660^2 + 897^2 .

It is not a de Polignac number, because 1240209 - 2¹ = 1240207 is a prime.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 1240191 and 1240200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1312 + ... + 2049.

It is an arithmetic number, because the mean of its divisors is an integer number (152971).

2^1240209 is an apocalyptic number.

It is an amenable number.

1240209 is a deficient number, since it is larger than the sum of its proper divisors (595443).

1240209 is a wasteful number, since it uses less digits than its factorization.

1240209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408 (or 3405 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1240209 is about 1113.6467123823. The cubic root of 1240209 is about 107.4397426858.

The spelling of 1240209 in words is "one million, two hundred forty thousand, two hundred nine".