1240891427 has 2 divisors, whose sum is σ = 1240891428. Its totient is φ = 1240891426.

The previous prime is 1240891409. The next prime is 1240891429. The reversal of 1240891427 is 7241980421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240891427 - 2¹² = 1240887331 is a prime.

Together with 1240891429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1240891429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620445713 + 620445714.

It is an arithmetic number, because the mean of its divisors is an integer number (620445714).

Almost surely, 2^1240891427 is an apocalyptic number.

1240891427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240891427 is an equidigital number, since it uses as much as digits as its factorization.

1240891427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 1240891427 is about 35226.2888621552. The cubic root of 1240891427 is about 1074.5944536962.

The spelling of 1240891427 in words is "one billion, two hundred forty million, eight hundred ninety-one thousand, four hundred twenty-seven".