338730391 has 2 divisors, whose sum is σ = 338730392. Its totient is φ = 338730390.

The previous prime is 338730373. The next prime is 338730401. The reversal of 338730391 is 193037833.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 338730391 - 2⁷ = 338730263 is a prime.

It is a super-2 number, since 2×338730391² = 229476555574025762, which contains 22 as substring.

It is equal to p_18229951 and since 338730391 and 18229951 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 338730391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (338730311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169365195 + 169365196.

It is an arithmetic number, because the mean of its divisors is an integer number (169365196).

Almost surely, 2^338730391 is an apocalyptic number.

338730391 is a deficient number, since it is larger than the sum of its proper divisors (1).

338730391 is an equidigital number, since it uses as much as digits as its factorization.

338730391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 338730391 is about 18404.6296077916. The cubic root of 338730391 is about 697.0833684749.

The spelling of 338730391 in words is "three hundred thirty-eight million, seven hundred thirty thousand, three hundred ninety-one".