198805390 has 16 divisors (see below), whose sum is σ = 408971232. Its totient is φ = 68161824.

The previous prime is 198805381. The next prime is 198805447. The reversal of 198805390 is 93508891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1419969 + ... + 1420108.

It is an arithmetic number, because the mean of its divisors is an integer number (25560702).

Almost surely, 2^198805390 is an apocalyptic number.

198805390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198805390 is an abundant number, since it is smaller than the sum of its proper divisors (210165842).

198805390 is a wasteful number, since it uses less digits than its factorization.

198805390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2840091.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 198805390 is about 14099.8365238750. The cubic root of 198805390 is about 583.6368680615.

The spelling of 198805390 in words is "one hundred ninety-eight million, eight hundred five thousand, three hundred ninety".