1191280 has 20 divisors (see below), whose sum is σ = 2769912. Its totient is φ = 476480.

The previous prime is 1191277. The next prime is 1191283. The reversal of 1191280 is 821911.

It is an interprime number because it is at equal distance from previous prime (1191277) and next prime (1191283).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7366 + ... + 7525.

2^1191280 is an apocalyptic number.

1191280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1191280 is an abundant number, since it is smaller than the sum of its proper divisors (1578632).

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

1191280 is a wasteful number, since it uses less digits than its factorization.

1191280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14904 (or 14898 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1191280 is about 1091.4577408219. The cubic root of 1191280 is about 106.0078313901.

The spelling of 1191280 in words is "one million, one hundred ninety-one thousand, two hundred eighty".