340205381 has 2 divisors, whose sum is σ = 340205382. Its totient is φ = 340205380.

The previous prime is 340205353. The next prime is 340205389. The reversal of 340205381 is 183502043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189750625 + 150454756 = 13775^2 + 12266^2 .

It is an emirp because it is prime and its reverse (183502043) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340205381 is a prime.

It is a super-3 number, since 3×340205381³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 340205381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340205389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170102690 + 170102691.

It is an arithmetic number, because the mean of its divisors is an integer number (170102691).

Almost surely, 2^340205381 is an apocalyptic number.

It is an amenable number.

340205381 is a deficient number, since it is larger than the sum of its proper divisors (1).

340205381 is an equidigital number, since it uses as much as digits as its factorization.

340205381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 340205381 is about 18444.6572481030. The cubic root of 340205381 is about 698.0937120178.

The spelling of 340205381 in words is "three hundred forty million, two hundred five thousand, three hundred eighty-one".