1244400999 has 8 divisors (see below), whose sum is σ = 1694503680. Its totient is φ = 811949496.

The previous prime is 1244400973. The next prime is 1244401009. The reversal of 1244400999 is 9990044421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1244400999 - 2¹⁵ = 1244368231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1244400999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1244400499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4412629 + ... + 4412910.

It is an arithmetic number, because the mean of its divisors is an integer number (211812960).

Almost surely, 2^1244400999 is an apocalyptic number.

1244400999 is a deficient number, since it is larger than the sum of its proper divisors (450102681).

1244400999 is an equidigital number, since it uses as much as digits as its factorization.

1244400999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8825589.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 1244400999 is about 35276.0683608590. The cubic root of 1244400999 is about 1075.6065800389.

The spelling of 1244400999 in words is "one billion, two hundred forty-four million, four hundred thousand, nine hundred ninety-nine".