198731438 has 8 divisors (see below), whose sum is σ = 301048920. Its totient is φ = 98381800.

The previous prime is 198731437. The next prime is 198731443. The reversal of 198731438 is 834137891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198731437) 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, 491708 + ... + 492111.

It is an arithmetic number, because the mean of its divisors is an integer number (37631115).

Almost surely, 2^198731438 is an apocalyptic number.

198731438 is a deficient number, since it is larger than the sum of its proper divisors (102317482).

198731438 is a wasteful number, since it uses less digits than its factorization.

198731438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983922.

The product of its digits is 145152, while the sum is 44.

The square root of 198731438 is about 14097.2138382022. The cubic root of 198731438 is about 583.5644916427.

The spelling of 198731438 in words is "one hundred ninety-eight million, seven hundred thirty-one thousand, four hundred thirty-eight".