1821023824 has 20 divisors (see below), whose sum is σ = 3642048640. Its totient is φ = 881140320.

The previous prime is 1821023797. The next prime is 1821023843. The reversal of 1821023824 is 4283201281.

It is a happy number.

1821023824 is an admirable number.

It is a super-2 number, since 2×1821023824² = 6632255535151165952, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1835214 + ... + 1836205.

It is an arithmetic number, because the mean of its divisors is an integer number (182102432).

Almost surely, 2^1821023824 is an apocalyptic number.

It is an amenable number.

1821023824 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1821023824 is a wasteful number, since it uses less digits than its factorization.

1821023824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671458 (or 3671452 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 1821023824 is about 42673.4557306999. The cubic root of 1821023824 is about 1221.1580475937.

The spelling of 1821023824 in words is "one billion, eight hundred twenty-one million, twenty-three thousand, eight hundred twenty-four".