428173439 has 2 divisors, whose sum is σ = 428173440. Its totient is φ = 428173438.

The previous prime is 428173433. The next prime is 428173463. The reversal of 428173439 is 934371824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428173439 - 2⁸ = 428173183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 428173396 and 428173405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428173433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214086719 + 214086720.

It is an arithmetic number, because the mean of its divisors is an integer number (214086720).

Almost surely, 2^428173439 is an apocalyptic number.

428173439 is a deficient number, since it is larger than the sum of its proper divisors (1).

428173439 is an equidigital number, since it uses as much as digits as its factorization.

428173439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 428173439 is about 20692.3521862547. The cubic root of 428173439 is about 753.7139863453.

The spelling of 428173439 in words is "four hundred twenty-eight million, one hundred seventy-three thousand, four hundred thirty-nine".