2391623 has 4 divisors (see below), whose sum is σ = 2575608. Its totient is φ = 2207640.

The previous prime is 2391589. The next prime is 2391629. The reversal of 2391623 is 3261932.

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

It is a cyclic number.

It is not a de Polignac number, because 2391623 - 2⁶ = 2391559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2391592 and 2391601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2391629) 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, 91973 + ... + 91998.

It is an arithmetic number, because the mean of its divisors is an integer number (643902).

2^2391623 is an apocalyptic number.

2391623 is a deficient number, since it is larger than the sum of its proper divisors (183985).

2391623 is a wasteful number, since it uses less digits than its factorization.

2391623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183984.

The product of its digits is 1944, while the sum is 26.

The square root of 2391623 is about 1546.4873100029. The cubic root of 2391623 is about 133.7306350978.

The spelling of 2391623 in words is "two million, three hundred ninety-one thousand, six hundred twenty-three".