1998468407 has 4 divisors (see below), whose sum is σ = 2152196760. Its totient is φ = 1844740056.

The previous prime is 1998468391. The next prime is 1998468419. The reversal of 1998468407 is 7048648991.

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 1998468407 - 2⁴ = 1998468391 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 (1998468467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76864157 + ... + 76864182.

It is an arithmetic number, because the mean of its divisors is an integer number (538049190).

Almost surely, 2^1998468407 is an apocalyptic number.

1998468407 is a deficient number, since it is larger than the sum of its proper divisors (153728353).

1998468407 is a wasteful number, since it uses less digits than its factorization.

1998468407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153728352.

The product of its (nonzero) digits is 3483648, while the sum is 56.

The square root of 1998468407 is about 44704.2325401074. The cubic root of 1998468407 is about 1259.5993533861.

The spelling of 1998468407 in words is "one billion, nine hundred ninety-eight million, four hundred sixty-eight thousand, four hundred seven".