1198640 has 20 divisors (see below), whose sum is σ = 2787024. Its totient is φ = 479424.

The previous prime is 1198621. The next prime is 1198643. The reversal of 1198640 is 468911.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1198643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7412 + ... + 7571.

2^1198640 is an apocalyptic number.

1198640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1198640 is an abundant number, since it is smaller than the sum of its proper divisors (1588384).

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

1198640 is a wasteful number, since it uses less digits than its factorization.

1198640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14996 (or 14990 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1198640 is about 1094.8241867990. The cubic root of 1198640 is about 106.2256968636.

The spelling of 1198640 in words is "one million, one hundred ninety-eight thousand, six hundred forty".