1998454319 has 4 divisors (see below), whose sum is σ = 1998726600. Its totient is φ = 1998182040.

The previous prime is 1998454309. The next prime is 1998454321. The reversal of 1998454319 is 9134548991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1998454319 - 2⁴ = 1998454303 is a prime.

It is a super-2 number, since 2×1998454319² = 7987639330259507522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998454309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124817 + ... + 139914.

It is an arithmetic number, because the mean of its divisors is an integer number (499681650).

Almost surely, 2^1998454319 is an apocalyptic number.

1998454319 is a deficient number, since it is larger than the sum of its proper divisors (272281).

1998454319 is an equidigital number, since it uses as much as digits as its factorization.

1998454319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272280.

The product of its digits is 1399680, while the sum is 53.

The square root of 1998454319 is about 44704.0749708570. The cubic root of 1998454319 is about 1259.5963935733.

The spelling of 1998454319 in words is "one billion, nine hundred ninety-eight million, four hundred fifty-four thousand, three hundred nineteen".