348821257 has 4 divisors (see below), whose sum is σ = 348886800. Its totient is φ = 348755716.

The previous prime is 348821233. The next prime is 348821281. The reversal of 348821257 is 752128843.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752128843 = 907 ⋅829249.

It is an interprime number because it is at equal distance from previous prime (348821233) and next prime (348821281).

It is a cyclic number.

It is not a de Polignac number, because 348821257 - 2⁷ = 348821129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (348821287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24007 + ... + 35692.

It is an arithmetic number, because the mean of its divisors is an integer number (87221700).

Almost surely, 2^348821257 is an apocalyptic number.

It is an amenable number.

348821257 is a deficient number, since it is larger than the sum of its proper divisors (65543).

348821257 is an equidigital number, since it uses as much as digits as its factorization.

348821257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65542.

The product of its digits is 107520, while the sum is 40.

The square root of 348821257 is about 18676.7571328644. The cubic root of 348821257 is about 703.9378449183.

The spelling of 348821257 in words is "three hundred forty-eight million, eight hundred twenty-one thousand, two hundred fifty-seven".