340921 has 8 divisors (see below), whose sum is σ = 393984. Its totient is φ = 288960.

The previous prime is 340919. The next prime is 340927. The reversal of 340921 is 129043.

340921 = T₁₄ + T₁₅ + ... + T₁₂₆.

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

It is not a de Polignac number, because 340921 - 2¹ = 340919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340927) 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 7 ways as a sum of consecutive naturals, for example, 576 + ... + 1006.

It is an arithmetic number, because the mean of its divisors is an integer number (49248).

2³⁴⁰⁹²¹ is an apocalyptic number.

It is an amenable number.

340921 is a deficient number, since it is larger than the sum of its proper divisors (53063).

340921 is a wasteful number, since it uses less digits than its factorization.

340921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 340921 is about 583.8844063682. The cubic root of 340921 is about 69.8582847190.

Adding to 340921 its reverse (129043), we get a palindrome (469964).

The spelling of 340921 in words is "three hundred forty thousand, nine hundred twenty-one".