623816407 has 2 divisors, whose sum is σ = 623816408. Its totient is φ = 623816406.

The previous prime is 623816339. The next prime is 623816423. The reversal of 623816407 is 704618326.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 623816407 - 2⁷ = 623816279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623816447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311908203 + 311908204.

It is an arithmetic number, because the mean of its divisors is an integer number (311908204).

Almost surely, 2^623816407 is an apocalyptic number.

623816407 is a deficient number, since it is larger than the sum of its proper divisors (1).

623816407 is an equidigital number, since it uses as much as digits as its factorization.

623816407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 623816407 is about 24976.3169222366. The cubic root of 623816407 is about 854.4479214710.

The spelling of 623816407 in words is "six hundred twenty-three million, eight hundred sixteen thousand, four hundred seven".