1216542 has 8 divisors (see below), whose sum is σ = 2433096. Its totient is φ = 405512.

The previous prime is 1216529. The next prime is 1216543. The reversal of 1216542 is 2456121.

It is a sphenic number, since it is the product of 3 distinct primes.

1216542 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101373 + ... + 101384.

It is an arithmetic number, because the mean of its divisors is an integer number (304137).

2^1216542 is an apocalyptic number.

1216542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216542 is a wasteful number, since it uses less digits than its factorization.

1216542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202762.

The product of its digits is 480, while the sum is 21.

The square root of 1216542 is about 1102.9696278683. The cubic root of 1216542 is about 106.7519218575.

The spelling of 1216542 in words is "one million, two hundred sixteen thousand, five hundred forty-two".