440987639 has 2 divisors, whose sum is σ = 440987640. Its totient is φ = 440987638.

The previous prime is 440987627. The next prime is 440987641. The reversal of 440987639 is 936789044.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 440987639 - 2²⁸ = 172552183 is a prime.

Together with 440987641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (440987669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220493819 + 220493820.

It is an arithmetic number, because the mean of its divisors is an integer number (220493820).

Almost surely, 2^440987639 is an apocalyptic number.

440987639 is a deficient number, since it is larger than the sum of its proper divisors (1).

440987639 is an equidigital number, since it uses as much as digits as its factorization.

440987639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 440987639 is about 20999.7056884138. The cubic root of 440987639 is about 761.1591493378.

The spelling of 440987639 in words is "four hundred forty million, nine hundred eighty-seven thousand, six hundred thirty-nine".