198965390 has 24 divisors (see below), whose sum is σ = 387809208. Its totient is φ = 73463520.

The previous prime is 198965381. The next prime is 198965401. The reversal of 198965390 is 93569891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57176 + ... + 60555.

It is an arithmetic number, because the mean of its divisors is an integer number (16158717).

Almost surely, 2^198965390 is an apocalyptic number.

198965390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198965390 is a deficient number, since it is larger than the sum of its proper divisors (188843818).

198965390 is a wasteful number, since it uses less digits than its factorization.

198965390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117764 (or 117751 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 198965390 is about 14105.5092073984. The cubic root of 198965390 is about 583.7933977857.

The spelling of 198965390 in words is "one hundred ninety-eight million, nine hundred sixty-five thousand, three hundred ninety".