1240979 has 2 divisors, whose sum is σ = 1240980. Its totient is φ = 1240978.

The previous prime is 1240973. The next prime is 1240991. The reversal of 1240979 is 9790421.

It is a weak prime.

It is an emirp because it is prime and its reverse (9790421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240979 - 2¹² = 1236883 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1240973) 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, 620489 + 620490.

It is an arithmetic number, because the mean of its divisors is an integer number (620490).

2^1240979 is an apocalyptic number.

1240979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240979 is an equidigital number, since it uses as much as digits as its factorization.

1240979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 1240979 is about 1113.9923698123. The cubic root of 1240979 is about 107.4619732095.

The spelling of 1240979 in words is "one million, two hundred forty thousand, nine hundred seventy-nine".