4400639 has 2 divisors, whose sum is σ = 4400640. Its totient is φ = 4400638.

The previous prime is 4400629. The next prime is 4400687. The reversal of 4400639 is 9360044.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4400639 - 2⁴ = 4400623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4400629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2200319 + 2200320.

It is an arithmetic number, because the mean of its divisors is an integer number (2200320).

Almost surely, 2^4400639 is an apocalyptic number.

4400639 is a deficient number, since it is larger than the sum of its proper divisors (1).

4400639 is an equidigital number, since it uses as much as digits as its factorization.

4400639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 4400639 is about 2097.7700064592. The cubic root of 4400639 is about 163.8721862557.

The spelling of 4400639 in words is "four million, four hundred thousand, six hundred thirty-nine".