1240091 has 4 divisors (see below), whose sum is σ = 1294032. Its totient is φ = 1186152.

The previous prime is 1240087. The next prime is 1240097. The reversal of 1240091 is 1900421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1240091 - 2² = 1240087 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1240097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26936 + ... + 26981.

It is an arithmetic number, because the mean of its divisors is an integer number (323508).

2^1240091 is an apocalyptic number.

1240091 is a deficient number, since it is larger than the sum of its proper divisors (53941).

1240091 is an equidigital number, since it uses as much as digits as its factorization.

1240091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53940.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1240091 is about 1113.5937320226. The cubic root of 1240091 is about 107.4363351172.

The spelling of 1240091 in words is "one million, two hundred forty thousand, ninety-one".