198765940 has 12 divisors (see below), whose sum is σ = 417408516. Its totient is φ = 79506368.

The previous prime is 198765923. The next prime is 198765947. The reversal of 198765940 is 49567891.

It can be written as a sum of positive squares in 2 ways, for example, as 77369616 + 121396324 = 8796^2 + 11018^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198765947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4969129 + ... + 4969168.

It is an arithmetic number, because the mean of its divisors is an integer number (34784043).

Almost surely, 2^198765940 is an apocalyptic number.

198765940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198765940 is an abundant number, since it is smaller than the sum of its proper divisors (218642576).

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

198765940 is a wasteful number, since it uses less digits than its factorization.

198765940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9938306 (or 9938304 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 198765940 is about 14098.4375020780. The cubic root of 198765940 is about 583.5982607958.

The spelling of 198765940 in words is "one hundred ninety-eight million, seven hundred sixty-five thousand, nine hundred forty".