1818642 has 64 divisors (see below), whose sum is σ = 4561920. Its totient is φ = 471744.

The previous prime is 1818631. The next prime is 1818647. The reversal of 1818642 is 2468181.

1818642 = T₄₂₈ + T₄₂₉ + ... + T₄₄₆.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34288 + ... + 34340.

It is an arithmetic number, because the mean of its divisors is an integer number (71280).

2^1818642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1818642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2280960).

1818642 is an abundant number, since it is smaller than the sum of its proper divisors (2743278).

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

1818642 is a wasteful number, since it uses less digits than its factorization.

1818642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127.

The product of its digits is 3072, while the sum is 30.

The square root of 1818642 is about 1348.5703541158. The cubic root of 1818642 is about 122.0625407194.

The spelling of 1818642 in words is "one million, eight hundred eighteen thousand, six hundred forty-two".