1980163998 has 24 divisors (see below), whose sum is σ = 4428755136. Its totient is φ = 638762400.

The previous prime is 1980163987. The next prime is 1980164009. The reversal of 1980163998 is 8993610891.

It is an interprime number because it is at equal distance from previous prime (1980163987) and next prime (1980164009).

It is a congruent number.

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, 1773783 + ... + 1774898.

It is an arithmetic number, because the mean of its divisors is an integer number (184531464).

Almost surely, 2^1980163998 is an apocalyptic number.

1980163998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1980163998 is an abundant number, since it is smaller than the sum of its proper divisors (2448591138).

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

1980163998 is a wasteful number, since it uses less digits than its factorization.

1980163998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548720 (or 3548717 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 54.

The square root of 1980163998 is about 44499.0336749013. The cubic root of 1980163998 is about 1255.7419036220.

The spelling of 1980163998 in words is "one billion, nine hundred eighty million, one hundred sixty-three thousand, nine hundred ninety-eight".