1698438444 has 12 divisors (see below), whose sum is σ = 3963023064. Its totient is φ = 566146144.

The previous prime is 1698438439. The next prime is 1698438451. The reversal of 1698438444 is 4448348961.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1698438444² = 5769386296114282272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70768257 + ... + 70768280.

It is an arithmetic number, because the mean of its divisors is an integer number (330251922).

Almost surely, 2^1698438444 is an apocalyptic number.

It is an amenable number.

1698438444 is an abundant number, since it is smaller than the sum of its proper divisors (2264584620).

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

1698438444 is a wasteful number, since it uses less digits than its factorization.

1698438444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141536544 (or 141536542 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 51.

The square root of 1698438444 is about 41212.1152575308. The cubic root of 1698438444 is about 1193.1176504039.

The spelling of 1698438444 in words is "one billion, six hundred ninety-eight million, four hundred thirty-eight thousand, four hundred forty-four".