1636542 has 48 divisors (see below), whose sum is σ = 3818880. Its totient is φ = 505296.

The previous prime is 1636541. The next prime is 1636543. The reversal of 1636542 is 2456361.

1636542 is a `hidden beast` number, since 1 + 6 + 3 + 654 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (1636541) and next prime (1636543).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1636541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24393 + ... + 24459.

It is an arithmetic number, because the mean of its divisors is an integer number (79560).

2^1636542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1636542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1909440).

1636542 is an abundant number, since it is smaller than the sum of its proper divisors (2182338).

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

1636542 is a wasteful number, since it uses less digits than its factorization.

1636542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 154 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 1636542 is about 1279.2740128682. The cubic root of 1636542 is about 117.8444277507.

The spelling of 1636542 in words is "one million, six hundred thirty-six thousand, five hundred forty-two".