616389 has 4 divisors (see below), whose sum is σ = 821856. Its totient is φ = 410924.

The previous prime is 616387. The next prime is 616391. The reversal of 616389 is 983616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (616387) and next prime (616391).

It is a cyclic number.

It is not a de Polignac number, because 616389 - 2¹ = 616387 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616387) 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, 102729 + ... + 102734.

It is an arithmetic number, because the mean of its divisors is an integer number (205464).

2⁶¹⁶³⁸⁹ is an apocalyptic number.

It is an amenable number.

616389 is a deficient number, since it is larger than the sum of its proper divisors (205467).

616389 is a wasteful number, since it uses less digits than its factorization.

616389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205466.

The product of its digits is 7776, while the sum is 33.

The square root of 616389 is about 785.1044516496. The cubic root of 616389 is about 85.1043240402.

The spelling of 616389 in words is "six hundred sixteen thousand, three hundred eighty-nine".