1217642 has 16 divisors (see below), whose sum is σ = 1969920. Its totient is φ = 562368.

The previous prime is 1217617. The next prime is 1217647. The reversal of 1217642 is 2467121.

It is not an unprimeable number, because it can be changed into a prime (1217647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1703 + ... + 2309.

It is an arithmetic number, because the mean of its divisors is an integer number (123120).

2^1217642 is an apocalyptic number.

1217642 is a deficient number, since it is larger than the sum of its proper divisors (752278).

1217642 is a wasteful number, since it uses less digits than its factorization.

1217642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685.

The product of its digits is 672, while the sum is 23.

The square root of 1217642 is about 1103.4681690017. The cubic root of 1217642 is about 106.7840872737.

The spelling of 1217642 in words is "one million, two hundred seventeen thousand, six hundred forty-two".