1242240407 has 2 divisors, whose sum is σ = 1242240408. Its totient is φ = 1242240406.

The previous prime is 1242240403. The next prime is 1242240421. The reversal of 1242240407 is 7040422421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1242240407 - 2² = 1242240403 is a prime.

It is a super-2 number, since 2×1242240407² = 3086322457567051298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242240403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621120203 + 621120204.

It is an arithmetic number, because the mean of its divisors is an integer number (621120204).

Almost surely, 2^1242240407 is an apocalyptic number.

1242240407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242240407 is an equidigital number, since it uses as much as digits as its factorization.

1242240407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 26.

The square root of 1242240407 is about 35245.4310088556. The cubic root of 1242240407 is about 1074.9837118859.

Adding to 1242240407 its reverse (7040422421), we get a palindrome (8282662828).

The spelling of 1242240407 in words is "one billion, two hundred forty-two million, two hundred forty thousand, four hundred seven".