423640355387 has 2 divisors, whose sum is σ = 423640355388. Its totient is φ = 423640355386.

The previous prime is 423640355357. The next prime is 423640355389. The reversal of 423640355387 is 783553046324.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 423640355387 - 2⁶ = 423640355323 is a prime.

Together with 423640355389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (423640355389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211820177693 + 211820177694.

It is an arithmetic number, because the mean of its divisors is an integer number (211820177694).

Almost surely, 2^423640355387 is an apocalyptic number.

423640355387 is a deficient number, since it is larger than the sum of its proper divisors (1).

423640355387 is an equidigital number, since it uses as much as digits as its factorization.

423640355387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7257600, while the sum is 50.

The spelling of 423640355387 in words is "four hundred twenty-three billion, six hundred forty million, three hundred fifty-five thousand, three hundred eighty-seven".