623439539 has 4 divisors (see below), whose sum is σ = 626235456. Its totient is φ = 620643624.

The previous prime is 623439497. The next prime is 623439613. The reversal of 623439539 is 935934326.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 935934326 = 2 ⋅467967163.

It is a cyclic number.

It is not a de Polignac number, because 623439539 - 2¹² = 623435443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 623439539.

It is not an unprimeable number, because it can be changed into a prime (623439139) 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, 1397624 + ... + 1398069.

It is an arithmetic number, because the mean of its divisors is an integer number (156558864).

Almost surely, 2^623439539 is an apocalyptic number.

623439539 is a deficient number, since it is larger than the sum of its proper divisors (2795917).

623439539 is a wasteful number, since it uses less digits than its factorization.

623439539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2795916.

The product of its digits is 524880, while the sum is 44.

The square root of 623439539 is about 24968.7712753351. The cubic root of 623439539 is about 854.2758201157.

The spelling of 623439539 in words is "six hundred twenty-three million, four hundred thirty-nine thousand, five hundred thirty-nine".