615423 has 4 divisors (see below), whose sum is σ = 820568. Its totient is φ = 410280.

The previous prime is 615413. The next prime is 615427. The reversal of 615423 is 324516.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-615423 is a prime.

It is a D-number.

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 615423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (615427) 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, 102568 + ... + 102573.

It is an arithmetic number, because the mean of its divisors is an integer number (205142).

2⁶¹⁵⁴²³ is an apocalyptic number.

615423 is a deficient number, since it is larger than the sum of its proper divisors (205145).

615423 is a wasteful number, since it uses less digits than its factorization.

615423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205144.

The product of its digits is 720, while the sum is 21.

The square root of 615423 is about 784.4890056591. The cubic root of 615423 is about 85.0598425190.

Adding to 615423 its reverse (324516), we get a palindrome (939939).

The spelling of 615423 in words is "six hundred fifteen thousand, four hundred twenty-three".