6401623 has 4 divisors (see below), whose sum is σ = 6409368. Its totient is φ = 6393880.

The previous prime is 6401621. The next prime is 6401669. The reversal of 6401623 is 3261046.

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 6401623 - 2¹ = 6401621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6401594 and 6401603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2461 + ... + 4342.

It is an arithmetic number, because the mean of its divisors is an integer number (1602342).

Almost surely, 2^6401623 is an apocalyptic number.

6401623 is a deficient number, since it is larger than the sum of its proper divisors (7745).

6401623 is an equidigital number, since it uses as much as digits as its factorization.

6401623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7744.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 6401623 is about 2530.1428813409. The cubic root of 6401623 is about 185.6792463903.

Adding to 6401623 its reverse (3261046), we get a palindrome (9662669).

The spelling of 6401623 in words is "six million, four hundred one thousand, six hundred twenty-three".