44138639 has 2 divisors, whose sum is σ = 44138640. Its totient is φ = 44138638.

The previous prime is 44138629. The next prime is 44138671. The reversal of 44138639 is 93683144.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 44138639 - 2⁴ = 44138623 is a prime.

It is a super-3 number, since 3×44138639³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (44138629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22069319 + 22069320.

It is an arithmetic number, because the mean of its divisors is an integer number (22069320).

Almost surely, 2^44138639 is an apocalyptic number.

44138639 is a deficient number, since it is larger than the sum of its proper divisors (1).

44138639 is an equidigital number, since it uses as much as digits as its factorization.

44138639 is an evil number, because the sum of its binary digits is even.

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

The square root of 44138639 is about 6643.6916695464. The cubic root of 44138639 is about 353.4052356539.

The spelling of 44138639 in words is "forty-four million, one hundred thirty-eight thousand, six hundred thirty-nine".