198496639 has 8 divisors (see below), whose sum is σ = 216871632. Its totient is φ = 180176640.

The previous prime is 198496637. The next prime is 198496699. The reversal of 198496639 is 936694891.

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

It is a cyclic number.

It is not a de Polignac number, because 198496639 - 2¹ = 198496637 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 198496639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198496637) 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, 6004 + ... + 20809.

It is an arithmetic number, because the mean of its divisors is an integer number (27108954).

Almost surely, 2^198496639 is an apocalyptic number.

198496639 is a deficient number, since it is larger than the sum of its proper divisors (18374993).

198496639 is a wasteful number, since it uses less digits than its factorization.

198496639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27497.

The product of its digits is 2519424, while the sum is 55.

The square root of 198496639 is about 14088.8835256737. The cubic root of 198496639 is about 583.3345760699.

The spelling of 198496639 in words is "one hundred ninety-eight million, four hundred ninety-six thousand, six hundred thirty-nine".