426139639 has 4 divisors (see below), whose sum is σ = 427528024. Its totient is φ = 424751256.

The previous prime is 426139633. The next prime is 426139643. The reversal of 426139639 is 936931624.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 426139639 - 2⁹ = 426139127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 426139595 and 426139604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (426139633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 693732 + ... + 694345.

It is an arithmetic number, because the mean of its divisors is an integer number (106882006).

Almost surely, 2^426139639 is an apocalyptic number.

426139639 is a deficient number, since it is larger than the sum of its proper divisors (1388385).

426139639 is a wasteful number, since it uses less digits than its factorization.

426139639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1388384.

The product of its digits is 209952, while the sum is 43.

The square root of 426139639 is about 20643.1499292138. The cubic root of 426139639 is about 752.5187253759.

The spelling of 426139639 in words is "four hundred twenty-six million, one hundred thirty-nine thousand, six hundred thirty-nine".