1442644538 has 4 divisors (see below), whose sum is σ = 2163966810. Its totient is φ = 721322268.

The previous prime is 1442644537. The next prime is 1442644547. The reversal of 1442644538 is 8354462441.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 1314570049 + 128074489 = 36257^2 + 11317^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1442644495 and 1442644504.

It is not an unprimeable number, because it can be changed into a prime (1442644537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360661133 + ... + 360661136.

Almost surely, 2^1442644538 is an apocalyptic number.

1442644538 is a deficient number, since it is larger than the sum of its proper divisors (721322272).

1442644538 is an equidigital number, since it uses as much as digits as its factorization.

1442644538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721322271.

The product of its digits is 368640, while the sum is 41.

The square root of 1442644538 is about 37982.1607863481. The cubic root of 1442644538 is about 1129.9340912299.

The spelling of 1442644538 in words is "one billion, four hundred forty-two million, six hundred forty-four thousand, five hundred thirty-eight".