344407921 has 16 divisors (see below), whose sum is σ = 406748160. Its totient is φ = 287493120.

The previous prime is 344407901. The next prime is 344407933. The reversal of 344407921 is 129704443.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 344407921 - 2⁷ = 344407793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (344407901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21360 + ... + 33838.

It is an arithmetic number, because the mean of its divisors is an integer number (25421760).

Almost surely, 2^344407921 is an apocalyptic number.

It is an amenable number.

344407921 is a deficient number, since it is larger than the sum of its proper divisors (62340239).

344407921 is a wasteful number, since it uses less digits than its factorization.

344407921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12696.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 344407921 is about 18558.2305460408. The cubic root of 344407921 is about 700.9564619077.

The spelling of 344407921 in words is "three hundred forty-four million, four hundred seven thousand, nine hundred twenty-one".