616405 has 16 divisors (see below), whose sum is σ = 785664. Its totient is φ = 463680.

The previous prime is 616393. The next prime is 616409. The reversal of 616405 is 504616.

It is not a de Polignac number, because 616405 - 2⁷ = 616277 is a prime.

It is a Duffinian number.

616405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10075 + ... + 10135.

It is an arithmetic number, because the mean of its divisors is an integer number (49104).

2⁶¹⁶⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

616405 is a deficient number, since it is larger than the sum of its proper divisors (169259).

616405 is a wasteful number, since it uses less digits than its factorization.

616405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 616405 is about 785.1146413104. The cubic root of 616405 is about 85.1050604028.

The spelling of 616405 in words is "six hundred sixteen thousand, four hundred five".