1998694471404 has 24 divisors (see below), whose sum is σ = 4777367274288. Its totient is φ = 649981941760.

The previous prime is 1998694471399. The next prime is 1998694471409. The reversal of 1998694471404 is 4041744968991.

It is an interprime number because it is at equal distance from previous prime (1998694471399) and next prime (1998694471409).

It is not an unprimeable number, because it can be changed into a prime (1998694471409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2031193077 + ... + 2031194060.

It is an arithmetic number, because the mean of its divisors is an integer number (199056969762).

Almost surely, 2^{1998694471404} is an apocalyptic number.

It is an amenable number.

1998694471404 is an abundant number, since it is smaller than the sum of its proper divisors (2778672802884).

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

1998694471404 is a wasteful number, since it uses less digits than its factorization.

1998694471404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4062387185 (or 4062387183 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 66.

The spelling of 1998694471404 in words is "one trillion, nine hundred ninety-eight billion, six hundred ninety-four million, four hundred seventy-one thousand, four hundred four".