1820651984 has 10 divisors (see below), whose sum is σ = 3527513250. Its totient is φ = 910325984.

The previous prime is 1820651951. The next prime is 1820652011. The reversal of 1820651984 is 4891560281.

It can be written as a sum of positive squares in only one way, i.e., 1001089600 + 819562384 = 31640^2 + 28628^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 56895359 + ... + 56895390.

It is an arithmetic number, because the mean of its divisors is an integer number (352751325).

Almost surely, 2^1820651984 is an apocalyptic number.

It is an amenable number.

1820651984 is a deficient number, since it is larger than the sum of its proper divisors (1706861266).

1820651984 is a wasteful number, since it uses less digits than its factorization.

1820651984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113790757 (or 113790751 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 1820651984 is about 42669.0987015193. The cubic root of 1820651984 is about 1221.0749246983.

The spelling of 1820651984 in words is "one billion, eight hundred twenty million, six hundred fifty-one thousand, nine hundred eighty-four".