1240999447 has 4 divisors (see below), whose sum is σ = 1241650080. Its totient is φ = 1240348816.

The previous prime is 1240999429. The next prime is 1240999469. The reversal of 1240999447 is 7449990421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240999447 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240999447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240999547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322447 + ... + 326272.

It is an arithmetic number, because the mean of its divisors is an integer number (310412520).

Almost surely, 2^1240999447 is an apocalyptic number.

1240999447 is a deficient number, since it is larger than the sum of its proper divisors (650633).

1240999447 is an equidigital number, since it uses as much as digits as its factorization.

1240999447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650632.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 1240999447 is about 35227.8220587081. The cubic root of 1240999447 is about 1074.6256340564.

The spelling of 1240999447 in words is "one billion, two hundred forty million, nine hundred ninety-nine thousand, four hundred forty-seven".