426639 has 8 divisors (see below), whose sum is σ = 577152. Its totient is φ = 280280.

The previous prime is 426637. The next prime is 426641. The reversal of 426639 is 936624.

It is an interprime number because it is at equal distance from previous prime (426637) and next prime (426641).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 426639 - 2¹ = 426637 is a prime.

426639 is a modest number, since divided by 639 gives 426 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 789 + ... + 1214.

It is an arithmetic number, because the mean of its divisors is an integer number (72144).

2⁴²⁶⁶³⁹ is an apocalyptic number.

426639 is a deficient number, since it is larger than the sum of its proper divisors (150513).

426639 is a wasteful number, since it uses less digits than its factorization.

426639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2077.

The product of its digits is 7776, while the sum is 30.

The square root of 426639 is about 653.1760865188. The cubic root of 426639 is about 75.2812550672.

The spelling of 426639 in words is "four hundred twenty-six thousand, six hundred thirty-nine".