1242009 has 12 divisors (see below), whose sum is σ = 1825200. Its totient is φ = 813624.

The previous prime is 1242001. The next prime is 1242029. The reversal of 1242009 is 9002421.

It is not a de Polignac number, because 1242009 - 2³ = 1242001 is a prime.

It is a Curzon number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1241982 and 1242000.

It is not an unprimeable number, because it can be changed into a prime (1242001) 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, 639 + ... + 1700.

It is an arithmetic number, because the mean of its divisors is an integer number (152100).

2^1242009 is an apocalyptic number.

It is an amenable number.

1242009 is a deficient number, since it is larger than the sum of its proper divisors (583191).

1242009 is a wasteful number, since it uses less digits than its factorization.

1242009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404 (or 2401 counting only the distinct ones).

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

The square root of 1242009 is about 1114.4545751174. The cubic root of 1242009 is about 107.4916957710.

The spelling of 1242009 in words is "one million, two hundred forty-two thousand, nine".