1115640 has 64 divisors (see below), whose sum is σ = 3722400. Its totient is φ = 297216.

The previous prime is 1115633. The next prime is 1115641. The reversal of 1115640 is 465111.

1115640 is a `hidden beast` number, since 11 + 15 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1115641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 564 + ... + 1596.

2^1115640 is an apocalyptic number.

1115640 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 1115640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1861200).

1115640 is an abundant number, since it is smaller than the sum of its proper divisors (2606760).

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

1115640 is a wasteful number, since it uses less digits than its factorization.

1115640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1053 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1115640 is about 1056.2386094060. The cubic root of 1115640 is about 103.7149492088.

It can be divided in two parts, 11 and 15640, that added together give a palindrome (15651).

The spelling of 1115640 in words is "one million, one hundred fifteen thousand, six hundred forty".