340443421 has 2 divisors, whose sum is σ = 340443422. Its totient is φ = 340443420.

The previous prime is 340443407. The next prime is 340443431. The reversal of 340443421 is 124344043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 260984025 + 79459396 = 16155^2 + 8914^2 .

It is a cyclic number.

It is not a de Polignac number, because 340443421 - 2⁷ = 340443293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340443431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170221710 + 170221711.

It is an arithmetic number, because the mean of its divisors is an integer number (170221711).

Almost surely, 2^340443421 is an apocalyptic number.

It is an amenable number.

340443421 is a deficient number, since it is larger than the sum of its proper divisors (1).

340443421 is an equidigital number, since it uses as much as digits as its factorization.

340443421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 340443421 is about 18451.1089368634. The cubic root of 340443421 is about 698.2564916155.

Adding to 340443421 its reverse (124344043), we get a palindrome (464787464).

The spelling of 340443421 in words is "three hundred forty million, four hundred forty-three thousand, four hundred twenty-one".