198638503 has 12 divisors (see below), whose sum is σ = 231953200. Its totient is φ = 170037840.

The previous prime is 198638501. The next prime is 198638507. The reversal of 198638503 is 305836891.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 198638503 - 2¹ = 198638501 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 198638503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198638501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260643 + ... + 261403.

Almost surely, 2^198638503 is an apocalyptic number.

198638503 is a deficient number, since it is larger than the sum of its proper divisors (33314697).

198638503 is an frugal number, since it uses more digits than its factorization.

198638503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 198638503 is about 14093.9172340411. The cubic root of 198638503 is about 583.4735112008.

The spelling of 198638503 in words is "one hundred ninety-eight million, six hundred thirty-eight thousand, five hundred three".