198743640 has 64 divisors (see below), whose sum is σ = 607500000. Its totient is φ = 51996672.

The previous prime is 198743627. The next prime is 198743653. The reversal of 198743640 is 46347891.

198743640 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (198743627) and next prime (198743653).

It is a junction number, because it is equal to n+sod(n) for n = 198743592 and 198743601.

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, 9265 + ... + 21984.

Almost surely, 2^198743640 is an apocalyptic number.

198743640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198743640 is an abundant number, since it is smaller than the sum of its proper divisors (408756360).

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

198743640 is a wasteful number, since it uses less digits than its factorization.

198743640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31316 (or 31312 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 198743640 is about 14097.6466121122. The cubic root of 198743640 is about 583.5764349103.

The spelling of 198743640 in words is "one hundred ninety-eight million, seven hundred forty-three thousand, six hundred forty".