344378021 has 16 divisors (see below), whose sum is σ = 392595840. Its totient is φ = 299453760.

The previous prime is 344378003. The next prime is 344378029. The reversal of 344378021 is 120873443.

It is a cyclic number.

It is not a de Polignac number, because 344378021 - 2¹⁰ = 344376997 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (344378029) 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 15 ways as a sum of consecutive naturals, for example, 40856 + ... + 48558.

It is an arithmetic number, because the mean of its divisors is an integer number (24537240).

Almost surely, 2^344378021 is an apocalyptic number.

It is an amenable number.

344378021 is a deficient number, since it is larger than the sum of its proper divisors (48217819).

344378021 is a wasteful number, since it uses less digits than its factorization.

344378021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7916.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 344378021 is about 18557.4249560654. The cubic root of 344378021 is about 700.9361766554.

The spelling of 344378021 in words is "three hundred forty-four million, three hundred seventy-eight thousand, twenty-one".