1988813444 has 6 divisors (see below), whose sum is σ = 3480423534. Its totient is φ = 994406720.

The previous prime is 1988813389. The next prime is 1988813479. The reversal of 1988813444 is 4443188891.

It can be written as a sum of positive squares in only one way, i.e., 1448715844 + 540097600 = 38062^2 + 23240^2 .

It is a super-2 number, since 2×1988813444² = 7910757830070282272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1988813392 and 1988813401.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248601677 + ... + 248601684.

It is an arithmetic number, because the mean of its divisors is an integer number (580070589).

Almost surely, 2^1988813444 is an apocalyptic number.

It is an amenable number.

1988813444 is a deficient number, since it is larger than the sum of its proper divisors (1491610090).

1988813444 is a wasteful number, since it uses less digits than its factorization.

1988813444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497203365 (or 497203363 counting only the distinct ones).

The product of its digits is 884736, while the sum is 50.

The square root of 1988813444 is about 44596.1146738144. The cubic root of 1988813444 is about 1257.5676270797.

The spelling of 1988813444 in words is "one billion, nine hundred eighty-eight million, eight hundred thirteen thousand, four hundred forty-four".