404421623 has 2 divisors, whose sum is σ = 404421624. Its totient is φ = 404421622.

The previous prime is 404421541. The next prime is 404421637. The reversal of 404421623 is 326124404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404421623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 404421592 and 404421601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404421683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202210811 + 202210812.

It is an arithmetic number, because the mean of its divisors is an integer number (202210812).

Almost surely, 2^404421623 is an apocalyptic number.

404421623 is a deficient number, since it is larger than the sum of its proper divisors (1).

404421623 is an equidigital number, since it uses as much as digits as its factorization.

404421623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 404421623 is about 20110.2367713560. The cubic root of 404421623 is about 739.5112568942.

The spelling of 404421623 in words is "four hundred four million, four hundred twenty-one thousand, six hundred twenty-three".