423553939 has 2 divisors, whose sum is σ = 423553940. Its totient is φ = 423553938.

The previous prime is 423553919. The next prime is 423553951. The reversal of 423553939 is 939355324.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423553939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 423553895 and 423553904.

It is not a weakly prime, because it can be changed into another prime (423553919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211776969 + 211776970.

It is an arithmetic number, because the mean of its divisors is an integer number (211776970).

Almost surely, 2^423553939 is an apocalyptic number.

423553939 is a deficient number, since it is larger than the sum of its proper divisors (1).

423553939 is an equidigital number, since it uses as much as digits as its factorization.

423553939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 437400, while the sum is 43.

The square root of 423553939 is about 20580.4261131785. The cubic root of 423553939 is about 750.9936098860.

The spelling of 423553939 in words is "four hundred twenty-three million, five hundred fifty-three thousand, nine hundred thirty-nine".