1998450975 has 12 divisors (see below), whose sum is σ = 3304105736. Its totient is φ = 1065840480.

The previous prime is 1998450973. The next prime is 1998450977. The reversal of 1998450975 is 5790548991.

It is an interprime number because it is at equal distance from previous prime (1998450973) and next prime (1998450977).

It is not a de Polignac number, because 1998450975 - 2¹ = 1998450973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998450973) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13322932 + ... + 13323081.

Almost surely, 2^1998450975 is an apocalyptic number.

1998450975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1998450975 is a deficient number, since it is larger than the sum of its proper divisors (1305654761).

1998450975 is a wasteful number, since it uses less digits than its factorization.

1998450975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26646026 (or 26646021 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 57.

The square root of 1998450975 is about 44704.0375693292. The cubic root of 1998450975 is about 1259.5956910149.

The spelling of 1998450975 in words is "one billion, nine hundred ninety-eight million, four hundred fifty thousand, nine hundred seventy-five".