198701640 has 128 divisors (see below), whose sum is σ = 665884800. Its totient is φ = 52704000.

The previous prime is 198701609. The next prime is 198701647. The reversal of 198701640 is 46107891.

198701640 is a `hidden beast` number, since 1 + 9 + 8 + 7 + 0 + 1 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 198701595 and 198701604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198701647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 270714 + ... + 271446.

It is an arithmetic number, because the mean of its divisors is an integer number (5202225).

Almost surely, 2^198701640 is an apocalyptic number.

198701640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198701640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332942400).

198701640 is an abundant number, since it is smaller than the sum of its proper divisors (467183160).

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

198701640 is a wasteful number, since it uses less digits than its factorization.

198701640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 198701640 is about 14096.1569230766. The cubic root of 198701640 is about 583.5353234278.

The spelling of 198701640 in words is "one hundred ninety-eight million, seven hundred one thousand, six hundred forty".