328725421 has 2 divisors, whose sum is σ = 328725422. Its totient is φ = 328725420.

The previous prime is 328725367. The next prime is 328725437. The reversal of 328725421 is 124527823.

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., 173448900 + 155276521 = 13170^2 + 12461^2 .

It is a cyclic number.

It is not a de Polignac number, because 328725421 - 2¹³ = 328717229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (328725461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164362710 + 164362711.

It is an arithmetic number, because the mean of its divisors is an integer number (164362711).

Almost surely, 2^328725421 is an apocalyptic number.

It is an amenable number.

328725421 is a deficient number, since it is larger than the sum of its proper divisors (1).

328725421 is an equidigital number, since it uses as much as digits as its factorization.

328725421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 34.

The square root of 328725421 is about 18130.7865521604. The cubic root of 328725421 is about 690.1514902272.

The spelling of 328725421 in words is "three hundred twenty-eight million, seven hundred twenty-five thousand, four hundred twenty-one".