439405423 has 2 divisors, whose sum is σ = 439405424. Its totient is φ = 439405422.

The previous prime is 439405367. The next prime is 439405427. The reversal of 439405423 is 324504934.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-439405423 is a prime.

It is a zygodrome in base 6.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439405427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219702711 + 219702712.

It is an arithmetic number, because the mean of its divisors is an integer number (219702712).

Almost surely, 2^439405423 is an apocalyptic number.

439405423 is a deficient number, since it is larger than the sum of its proper divisors (1).

439405423 is an equidigital number, since it uses as much as digits as its factorization.

439405423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 439405423 is about 20961.9994990936. Note that the first 3 decimals coincide. The cubic root of 439405423 is about 760.2477395257.

The spelling of 439405423 in words is "four hundred thirty-nine million, four hundred five thousand, four hundred twenty-three".