340249921 has 8 divisors (see below), whose sum is σ = 371346624. Its totient is φ = 309180720.

The previous prime is 340249859. The next prime is 340249957. The reversal of 340249921 is 129942043.

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 340249921 - 2⁹ = 340249409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (340249981) 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 7 ways as a sum of consecutive naturals, for example, 25756 + ... + 36658.

It is an arithmetic number, because the mean of its divisors is an integer number (46418328).

Almost surely, 2^340249921 is an apocalyptic number.

It is an amenable number.

340249921 is a deficient number, since it is larger than the sum of its proper divisors (31096703).

340249921 is a wasteful number, since it uses less digits than its factorization.

340249921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13751.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 340249921 is about 18445.8646042955. The cubic root of 340249921 is about 698.1241757111.

The spelling of 340249921 in words is "three hundred forty million, two hundred forty-nine thousand, nine hundred twenty-one".