1623623 has 4 divisors (see below), whose sum is σ = 1679640. Its totient is φ = 1567608.

The previous prime is 1623599. The next prime is 1623631. The reversal of 1623623 is 3263261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3263261 = 151 ⋅21611.

It is a cyclic number.

It is not a de Polignac number, because 1623623 - 2⁸ = 1623367 is a prime.

It is a super-2 number, since 2×1623623² = 5272303292258, which contains 22 as substring.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 6⁴ + 2⁵ + 3⁹ + 6⁵ + 2⁹ + 3¹³ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623023) 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, 27965 + ... + 28022.

It is an arithmetic number, because the mean of its divisors is an integer number (419910).

2^1623623 is an apocalyptic number.

1623623 is a deficient number, since it is larger than the sum of its proper divisors (56017).

1623623 is an equidigital number, since it uses as much as digits as its factorization.

1623623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56016.

The product of its digits is 1296, while the sum is 23.

The square root of 1623623 is about 1274.2146600946. The cubic root of 1623623 is about 117.5335169209.

Adding to 1623623 its reverse (3263261), we get a palindrome (4886884).

The spelling of 1623623 in words is "one million, six hundred twenty-three thousand, six hundred twenty-three".