1816542 has 48 divisors (see below), whose sum is σ = 4848480. Its totient is φ = 478656.

The previous prime is 1816523. The next prime is 1816543. The reversal of 1816542 is 2456181.

1816542 is a `hidden beast` number, since 1 + 8 + 1 + 654 + 2 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1084 + ... + 2192.

It is an arithmetic number, because the mean of its divisors is an integer number (101010).

2^1816542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1816542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2424240).

1816542 is an abundant number, since it is smaller than the sum of its proper divisors (3031938).

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

1816542 is a wasteful number, since it uses less digits than its factorization.

1816542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137 (or 1134 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 1816542 is about 1347.7915269061. The cubic root of 1816542 is about 122.0155404373.

The spelling of 1816542 in words is "one million, eight hundred sixteen thousand, five hundred forty-two".