198040640 has 56 divisors (see below), whose sum is σ = 538959552. Its totient is φ = 67898880.

The previous prime is 198040637. The next prime is 198040643. The reversal of 198040640 is 46040891.

198040640 is digitally balanced in base 2, because in such base 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 (198040637) and next prime (198040643).

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 198040597 and 198040606.

It is not an unprimeable number, because it can be changed into a prime (198040643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41966 + ... + 46445.

Almost surely, 2^198040640 is an apocalyptic number.

198040640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198040640 is an abundant number, since it is smaller than the sum of its proper divisors (340918912).

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

198040640 is an equidigital number, since it uses as much as digits as its factorization.

198040640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88435 (or 88425 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 198040640 is about 14072.6912848964. The cubic root of 198040640 is about 582.8875425824.

The spelling of 198040640 in words is "one hundred ninety-eight million, forty thousand, six hundred forty".