623401 has 2 divisors, whose sum is σ = 623402. Its totient is φ = 623400.

The previous prime is 623393. The next prime is 623417. The reversal of 623401 is 104326.

It is an a-pointer prime, because the next prime (623417) can be obtained adding 623401 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524176 + 99225 = 724^2 + 315^2 .

It is a cyclic number.

It is not a de Polignac number, because 623401 - 2³ = 623393 is a prime.

It is not a weakly prime, because it can be changed into another prime (623431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311700 + 311701.

It is an arithmetic number, because the mean of its divisors is an integer number (311701).

2⁶²³⁴⁰¹ is an apocalyptic number.

It is an amenable number.

623401 is a deficient number, since it is larger than the sum of its proper divisors (1).

623401 is an equidigital number, since it uses as much as digits as its factorization.

623401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 623401 is about 789.5574709925. The cubic root of 623401 is about 85.4258216904.

Adding to 623401 its reverse (104326), we get a palindrome (727727).

It can be divided in two parts, 623 and 401, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 623401 in words is "six hundred twenty-three thousand, four hundred one".