1021818384 has 30 divisors (see below), whose sum is σ = 2859672686. Its totient is φ = 340606080.

The previous prime is 1021818377. The next prime is 1021818389. The reversal of 1021818384 is 4838181201.

It can be written as a sum of positive squares in only one way, i.e., 877818384 + 144000000 = 29628^2 + 12000^2 .

It is a super-2 number, since 2×1021818384² = 2088225619760742912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1021818389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3547837 + ... + 3548124.

Almost surely, 2^1021818384 is an apocalyptic number.

It is an amenable number.

1021818384 is an abundant number, since it is smaller than the sum of its proper divisors (1837854302).

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

1021818384 is a wasteful number, since it uses less digits than its factorization.

1021818384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7095975 (or 7095966 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 1021818384 is about 31965.8940747791. The cubic root of 1021818384 is about 1007.2205330852.

Adding to 1021818384 its reverse (4838181201), we get a palindrome (5859999585).

The spelling of 1021818384 in words is "one billion, twenty-one million, eight hundred eighteen thousand, three hundred eighty-four".