340821401 has 4 divisors (see below), whose sum is σ = 340995600. Its totient is φ = 340647204.

The previous prime is 340821379. The next prime is 340821407. The reversal of 340821401 is 104128043.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340821401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340821407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84131 + ... + 88088.

It is an arithmetic number, because the mean of its divisors is an integer number (85248900).

Almost surely, 2^340821401 is an apocalyptic number.

It is an amenable number.

340821401 is a deficient number, since it is larger than the sum of its proper divisors (174199).

340821401 is a wasteful number, since it uses less digits than its factorization.

340821401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174198.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 340821401 is about 18461.3488402121. The cubic root of 340821401 is about 698.5148109690.

Adding to 340821401 its reverse (104128043), we get a palindrome (444949444).

The spelling of 340821401 in words is "three hundred forty million, eight hundred twenty-one thousand, four hundred one".