198079440 has 80 divisors (see below), whose sum is σ = 661291008. Its totient is φ = 48757248.

The previous prime is 198079439. The next prime is 198079459. The reversal of 198079440 is 44970891.

It is a tau number, because it is divible by the number of its divisors (80).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 198079392 and 198079401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28624 + ... + 34863.

Almost surely, 2^198079440 is an apocalyptic number.

198079440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198079440 is an abundant number, since it is smaller than the sum of its proper divisors (463211568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198079440 is a wasteful number, since it uses less digits than its factorization.

198079440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63516 (or 63510 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 198079440 is about 14074.0697738785. The cubic root of 198079440 is about 582.9256064193.

The spelling of 198079440 in words is "one hundred ninety-eight million, seventy-nine thousand, four hundred forty".