1166640 has 40 divisors (see below), whose sum is σ = 3617328. Its totient is φ = 311040.

The previous prime is 1166639. The next prime is 1166663. The reversal of 1166640 is 466611.

1166640 = T₃₅₁ + T₃₅₂ + ... + T₃₆₈.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×1166640² = 2722097779200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1166640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2191 + ... + 2670.

2^1166640 is an apocalyptic number.

1166640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1166640 is an abundant number, since it is smaller than the sum of its proper divisors (2450688).

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

1166640 is a wasteful number, since it uses less digits than its factorization.

1166640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4877 (or 4871 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1166640 is about 1080.1111053961. Note that the first 4 decimals coincide. The cubic root of 1166640 is about 105.2718578774.

The spelling of 1166640 in words is "one million, one hundred sixty-six thousand, six hundred forty".