198039644 has 12 divisors (see below), whose sum is σ = 378075768. Its totient is φ = 90018000.

The previous prime is 198039631. The next prime is 198039691. The reversal of 198039644 is 446930891.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 4500901 = 198039644 / (1 + 9 + 8 + 0 + 3 + 9 + 6 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 198039595 and 198039604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2250407 + ... + 2250494.

It is an arithmetic number, because the mean of its divisors is an integer number (31506314).

Almost surely, 2^198039644 is an apocalyptic number.

It is an amenable number.

198039644 is a deficient number, since it is larger than the sum of its proper divisors (180036124).

198039644 is a wasteful number, since it uses less digits than its factorization.

198039644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500916 (or 4500914 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 198039644 is about 14072.6558971645. The cubic root of 198039644 is about 582.8865654144.

The spelling of 198039644 in words is "one hundred ninety-eight million, thirty-nine thousand, six hundred forty-four".