1915987984 has 45 divisors (see below), whose sum is σ = 3846736029. Its totient is φ = 924464640.

The previous prime is 1915987973. The next prime is 1915988017. The reversal of 1915987984 is 4897895191.

The square root of 1915987984 is 43772.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 778410000 + 1137577984 = 27900^2 + 33728^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5427552 + ... + 5427904.

Almost surely, 2^1915987984 is an apocalyptic number.

1915987984 is the 43772-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1915987984

1915987984 is an abundant number, since it is smaller than the sum of its proper divisors (1930748045).

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

1915987984 is an frugal number, since it uses more digits than its factorization.

1915987984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776 (or 386 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 61.

The cubic root of 1915987984 is about 1242.0266857316.

The spelling of 1915987984 in words is "one billion, nine hundred fifteen million, nine hundred eighty-seven thousand, nine hundred eighty-four".