344140421 has 6 divisors (see below), whose sum is σ = 359754150. Its totient is φ = 329177288.

The previous prime is 344140417. The next prime is 344140457. The reversal of 344140421 is 124041443.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 281904100 + 62236321 = 16790^2 + 7889^2 .

It is not a de Polignac number, because 344140421 - 2² = 344140417 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (344140411) 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 5 ways as a sum of consecutive naturals, for example, 324746 + ... + 325803.

It is an arithmetic number, because the mean of its divisors is an integer number (59959025).

Almost surely, 2^344140421 is an apocalyptic number.

It is an amenable number.

344140421 is a deficient number, since it is larger than the sum of its proper divisors (15613729).

344140421 is an equidigital number, since it uses as much as digits as its factorization.

344140421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650595 (or 650572 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 344140421 is about 18551.0221012213. The cubic root of 344140421 is about 700.7749383828.

Adding to 344140421 its reverse (124041443), we get a palindrome (468181864).

The spelling of 344140421 in words is "three hundred forty-four million, one hundred forty thousand, four hundred twenty-one".