1444400399 has 4 divisors (see below), whose sum is σ = 1555508136. Its totient is φ = 1333292664.

The previous prime is 1444400341. The next prime is 1444400407. The reversal of 1444400399 is 9930044441.

It is a happy number.

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-1444400399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1444400599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55553849 + ... + 55553874.

It is an arithmetic number, because the mean of its divisors is an integer number (388877034).

Almost surely, 2^1444400399 is an apocalyptic number.

1444400399 is a deficient number, since it is larger than the sum of its proper divisors (111107737).

1444400399 is a wasteful number, since it uses less digits than its factorization.

1444400399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111107736.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 1444400399 is about 38005.2680427332. The cubic root of 1444400399 is about 1130.3923244201.

The spelling of 1444400399 in words is "one billion, four hundred forty-four million, four hundred thousand, three hundred ninety-nine".