1186640 has 80 divisors (see below), whose sum is σ = 3416448. Its totient is φ = 373248.

The previous prime is 1186631. The next prime is 1186657. The reversal of 1186640 is 466811.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1186640² = 2816228979200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7199 + ... + 7361.

2^1186640 is an apocalyptic number.

1186640 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 1186640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1708224).

1186640 is an abundant number, since it is smaller than the sum of its proper divisors (2229808).

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

1186640 is a wasteful number, since it uses less digits than its factorization.

1186640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1186640 is about 1089.3300693546. The cubic root of 1186640 is about 105.8700198659.

The spelling of 1186640 in words is "one million, one hundred eighty-six thousand, six hundred forty".