1444564381 has 16 divisors (see below), whose sum is σ = 1675699200. Its totient is φ = 1234316160.

The previous prime is 1444564313. The next prime is 1444564393. The reversal of 1444564381 is 1834654441.

It is a de Polignac number, because none of the positive numbers 2^k-1444564381 is a prime.

It is a super-2 number, since 2×1444564381² = 4173532501707826322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1444564981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68656 + ... + 87193.

It is an arithmetic number, because the mean of its divisors is an integer number (104731200).

Almost surely, 2^1444564381 is an apocalyptic number.

It is an amenable number.

1444564381 is a deficient number, since it is larger than the sum of its proper divisors (231134819).

1444564381 is a wasteful number, since it uses less digits than its factorization.

1444564381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155916.

The product of its digits is 184320, while the sum is 40.

The square root of 1444564381 is about 38007.4253403200. The cubic root of 1444564381 is about 1130.4351004121.

The spelling of 1444564381 in words is "one billion, four hundred forty-four million, five hundred sixty-four thousand, three hundred eighty-one".