1821984042 has 16 divisors (see below), whose sum is σ = 3659610240. Its totient is φ = 604720992.

The previous prime is 1821984041. The next prime is 1821984071. The reversal of 1821984042 is 2404891281.

It is not an unprimeable number, because it can be changed into a prime (1821984041) 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, 650242 + ... + 653037.

It is an arithmetic number, because the mean of its divisors is an integer number (228725640).

Almost surely, 2^1821984042 is an apocalyptic number.

1821984042 is an abundant number, since it is smaller than the sum of its proper divisors (1837626198).

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

1821984042 is a wasteful number, since it uses less digits than its factorization.

1821984042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303517.

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 1821984042 is about 42684.7050124515. The cubic root of 1821984042 is about 1221.3726470010.

The spelling of 1821984042 in words is "one billion, eight hundred twenty-one million, nine hundred eighty-four thousand, forty-two".