444537993 has 4 divisors (see below), whose sum is σ = 592717328. Its totient is φ = 296358660.

The previous prime is 444537979. The next prime is 444538007. The reversal of 444537993 is 399735444.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (444537979) and next prime (444538007).

It is not a de Polignac number, because 444537993 - 2¹² = 444533897 is a prime.

It is a super-2 number, since 2×444537993² = 395228054440936098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (444530993) 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, 74089663 + ... + 74089668.

It is an arithmetic number, because the mean of its divisors is an integer number (148179332).

Almost surely, 2^444537993 is an apocalyptic number.

It is an amenable number.

444537993 is a deficient number, since it is larger than the sum of its proper divisors (148179335).

444537993 is a wasteful number, since it uses less digits than its factorization.

444537993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148179334.

The product of its digits is 1632960, while the sum is 48.

The square root of 444537993 is about 21084.0696498565. The cubic root of 444537993 is about 763.1963677946.

The spelling of 444537993 in words is "four hundred forty-four million, five hundred thirty-seven thousand, nine hundred ninety-three".