338390381 has 4 divisors (see below), whose sum is σ = 386731872. Its totient is φ = 290048892.

The previous prime is 338390369. The next prime is 338390407. The reversal of 338390381 is 183093833.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-338390381 is a prime.

It is a super-2 number, since 2×338390381² = 229016099906650322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (338390341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24170735 + ... + 24170748.

It is an arithmetic number, because the mean of its divisors is an integer number (96682968).

Almost surely, 2^338390381 is an apocalyptic number.

It is an amenable number.

338390381 is a deficient number, since it is larger than the sum of its proper divisors (48341491).

338390381 is an equidigital number, since it uses as much as digits as its factorization.

338390381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48341490.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 338390381 is about 18395.3902105935. The cubic root of 338390381 is about 696.8500514867.

The spelling of 338390381 in words is "three hundred thirty-eight million, three hundred ninety thousand, three hundred eighty-one".