1240065667 has 2 divisors, whose sum is σ = 1240065668. Its totient is φ = 1240065666.

The previous prime is 1240065649. The next prime is 1240065679. The reversal of 1240065667 is 7665600421.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240065667 - 2²³ = 1231677059 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240065467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620032833 + 620032834.

It is an arithmetic number, because the mean of its divisors is an integer number (620032834).

Almost surely, 2^1240065667 is an apocalyptic number.

1240065667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240065667 is an equidigital number, since it uses as much as digits as its factorization.

1240065667 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 1240065667 is about 35214.5661197181. The cubic root of 1240065667 is about 1074.3560353027.

The spelling of 1240065667 in words is "one billion, two hundred forty million, sixty-five thousand, six hundred sixty-seven".