428325409 has 2 divisors, whose sum is σ = 428325410. Its totient is φ = 428325408.

The previous prime is 428325371. The next prime is 428325433. The reversal of 428325409 is 904523824.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420373009 + 7952400 = 20503^2 + 2820^2 .

It is a cyclic number.

It is not a de Polignac number, because 428325409 - 2¹⁷ = 428194337 is a prime.

It is not a weakly prime, because it can be changed into another prime (428325449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214162704 + 214162705.

It is an arithmetic number, because the mean of its divisors is an integer number (214162705).

Almost surely, 2^428325409 is an apocalyptic number.

It is an amenable number.

428325409 is a deficient number, since it is larger than the sum of its proper divisors (1).

428325409 is an equidigital number, since it uses as much as digits as its factorization.

428325409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 428325409 is about 20696.0239901291. The cubic root of 428325409 is about 753.8031467613.

It can be divided in two parts, 4283 and 25409, that added together give a palindrome (29692).

The spelling of 428325409 in words is "four hundred twenty-eight million, three hundred twenty-five thousand, four hundred nine".