707639 has 4 divisors (see below), whose sum is σ = 715680. Its totient is φ = 699600.

The previous prime is 707633. The next prime is 707647. The reversal of 707639 is 936707.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936707 = 179 ⋅5233.

It is a cyclic number.

It is not a de Polignac number, because 707639 - 2⁸ = 707383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (707633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3887 + ... + 4064.

It is an arithmetic number, because the mean of its divisors is an integer number (178920).

2⁷⁰⁷⁶³⁹ is an apocalyptic number.

707639 is a deficient number, since it is larger than the sum of its proper divisors (8041).

707639 is an equidigital number, since it uses as much as digits as its factorization.

707639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8040.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 707639 is about 841.2128149285. The cubic root of 707639 is about 89.1122179981.

The spelling of 707639 in words is "seven hundred seven thousand, six hundred thirty-nine".