340421399 has 2 divisors, whose sum is σ = 340421400. Its totient is φ = 340421398.

The previous prime is 340421381. The next prime is 340421407. The reversal of 340421399 is 993124043.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 340421399 - 2⁸ = 340421143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340421339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170210699 + 170210700.

It is an arithmetic number, because the mean of its divisors is an integer number (170210700).

Almost surely, 2^340421399 is an apocalyptic number.

340421399 is a deficient number, since it is larger than the sum of its proper divisors (1).

340421399 is an equidigital number, since it uses as much as digits as its factorization.

340421399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 340421399 is about 18450.5121609130. The cubic root of 340421399 is about 698.2414354319.

The spelling of 340421399 in words is "three hundred forty million, four hundred twenty-one thousand, three hundred ninety-nine".