2623405 has 4 divisors (see below), whose sum is σ = 3148092. Its totient is φ = 2098720.

The previous prime is 2623391. The next prime is 2623409. The reversal of 2623405 is 5043262.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1726596 + 896809 = 1314^2 + 947^2 .

It is not a de Polignac number, because 2623405 - 2⁵ = 2623373 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2623409) 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, 262336 + ... + 262345.

It is an arithmetic number, because the mean of its divisors is an integer number (787023).

2^2623405 is an apocalyptic number.

It is an amenable number.

2623405 is a deficient number, since it is larger than the sum of its proper divisors (524687).

2623405 is an equidigital number, since it uses as much as digits as its factorization.

2623405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524686.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 2623405 is about 1619.6928721211. The cubic root of 2623405 is about 137.9182635769.

Adding to 2623405 its reverse (5043262), we get a palindrome (7666667).

The spelling of 2623405 in words is "two million, six hundred twenty-three thousand, four hundred five".