623455397 has 2 divisors, whose sum is σ = 623455398. Its totient is φ = 623455396.

The previous prime is 623455363. The next prime is 623455403. The reversal of 623455397 is 793554326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530795521 + 92659876 = 23039^2 + 9626^2 .

It is a cyclic number.

It is not a de Polignac number, because 623455397 - 2²⁴ = 606678181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623455337) 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 as a sum of consecutive naturals, namely, 311727698 + 311727699.

It is an arithmetic number, because the mean of its divisors is an integer number (311727699).

Almost surely, 2^623455397 is an apocalyptic number.

It is an amenable number.

623455397 is a deficient number, since it is larger than the sum of its proper divisors (1).

623455397 is an equidigital number, since it uses as much as digits as its factorization.

623455397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 44.

The square root of 623455397 is about 24969.0888299914. The cubic root of 623455397 is about 854.2830632618.

The spelling of 623455397 in words is "six hundred twenty-three million, four hundred fifty-five thousand, three hundred ninety-seven".