340904821 has 8 divisors (see below), whose sum is σ = 363172320. Its totient is φ = 319069872.

The previous prime is 340904813. The next prime is 340904833. The reversal of 340904821 is 128409043.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 340904821 - 2³ = 340904813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340904881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106510 + ... + 109663.

It is an arithmetic number, because the mean of its divisors is an integer number (45396540).

Almost surely, 2^340904821 is an apocalyptic number.

It is an amenable number.

340904821 is a deficient number, since it is larger than the sum of its proper divisors (22267499).

340904821 is a wasteful number, since it uses less digits than its factorization.

340904821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216275.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 340904821 is about 18463.6080168530. The cubic root of 340904821 is about 698.5717961934.

The spelling of 340904821 in words is "three hundred forty million, nine hundred four thousand, eight hundred twenty-one".