344487989 has 2 divisors, whose sum is σ = 344487990. Its totient is φ = 344487988.

The previous prime is 344487977. The next prime is 344487991. The reversal of 344487989 is 989784443.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 257345764 + 87142225 = 16042^2 + 9335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-344487989 is a prime.

Together with 344487991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (344487089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172243994 + 172243995.

It is an arithmetic number, because the mean of its divisors is an integer number (172243995).

Almost surely, 2^344487989 is an apocalyptic number.

It is an amenable number.

344487989 is a deficient number, since it is larger than the sum of its proper divisors (1).

344487989 is an equidigital number, since it uses as much as digits as its factorization.

344487989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 56.

The square root of 344487989 is about 18560.3876306504. The cubic root of 344487989 is about 701.0107771832.

The spelling of 344487989 in words is "three hundred forty-four million, four hundred eighty-seven thousand, nine hundred eighty-nine".