1599999998 has 4 divisors (see below), whose sum is σ = 2400000000. Its totient is φ = 799999998.

The previous prime is 1599999983. The next prime is 1600000009. The reversal of 1599999998 is 8999999951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8999999951 = 22907 ⋅392893.

It is a Curzon number.

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, 399999998 + ... + 400000001.

It is an arithmetic number, because the mean of its divisors is an integer number (600000000).

Almost surely, 2^1599999998 is an apocalyptic number.

1599999998 is a deficient number, since it is larger than the sum of its proper divisors (800000002).

1599999998 is an equidigital number, since it uses as much as digits as its factorization.

1599999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800000001.

The product of its digits is 191318760, while the sum is 77.

The square root of 1599999998 is about 39999.9999750000. Note that the first 4 decimals coincide. The cubic root of 1599999998 is about 1169.6070947978.

The spelling of 1599999998 in words is "one billion, five hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".