1242605 has 16 divisors (see below), whose sum is σ = 1835904. Its totient is φ = 786240.

The previous prime is 1242601. The next prime is 1242611. The reversal of 1242605 is 5062421.

It is a happy number.

It is not a de Polignac number, because 1242605 - 2² = 1242601 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 911 + ... + 1820.

It is an arithmetic number, because the mean of its divisors is an integer number (114744).

2^1242605 is an apocalyptic number.

It is an amenable number.

1242605 is a deficient number, since it is larger than the sum of its proper divisors (593299).

1242605 is a wasteful number, since it uses less digits than its factorization.

1242605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1242605 is about 1114.7219384223. The cubic root of 1242605 is about 107.5088869523.

The spelling of 1242605 in words is "one million, two hundred forty-two thousand, six hundred five".