1999098540 has 36 divisors (see below), whose sum is σ = 6063932784. Its totient is φ = 533092896.

The previous prime is 1999098539. The next prime is 1999098551. The reversal of 1999098540 is 458909991.

1999098540 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 0 + 98 + 540 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5552872 + ... + 5553231.

Almost surely, 2^1999098540 is an apocalyptic number.

1999098540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999098540 is an abundant number, since it is smaller than the sum of its proper divisors (4064834244).

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

1999098540 is a wasteful number, since it uses less digits than its factorization.

1999098540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11106118 (or 11106113 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 54.

The square root of 1999098540 is about 44711.2797848597. The cubic root of 1999098540 is about 1259.7317267092.

The spelling of 1999098540 in words is "one billion, nine hundred ninety-nine million, ninety-eight thousand, five hundred forty".