1991459592 has 96 divisors (see below), whose sum is σ = 5603969280. Its totient is φ = 638202240.

The previous prime is 1991459579. The next prime is 1991459633. The reversal of 1991459592 is 2959541991.

1991459592 is a `hidden beast` number, since 1 + 9 + 9 + 1 + 45 + 9 + 592 = 666.

It is a super-2 number, since 2×1991459592² = 7931822613137612928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 347583 + ... + 353265.

It is an arithmetic number, because the mean of its divisors is an integer number (58374680).

Almost surely, 2^1991459592 is an apocalyptic number.

1991459592 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1991459592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2801984640).

1991459592 is an abundant number, since it is smaller than the sum of its proper divisors (3612509688).

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

1991459592 is a wasteful number, since it uses less digits than its factorization.

1991459592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5883 (or 5876 counting only the distinct ones).

The product of its digits is 1312200, while the sum is 54.

The square root of 1991459592 is about 44625.7727328054. The cubic root of 1991459592 is about 1258.1251178295.

The spelling of 1991459592 in words is "one billion, nine hundred ninety-one million, four hundred fifty-nine thousand, five hundred ninety-two".