338390491 has 4 divisors (see below), whose sum is σ = 358295832. Its totient is φ = 318485152.

The previous prime is 338390483. The next prime is 338390509. The reversal of 338390491 is 194093833.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194093833 = 6379 ⋅30427.

It is a cyclic number.

It is not a de Polignac number, because 338390491 - 2³ = 338390483 is a prime.

It is a super-2 number, since 2×338390491² = 229016248798442162, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (338390431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9952645 + ... + 9952678.

It is an arithmetic number, because the mean of its divisors is an integer number (89573958).

Almost surely, 2^338390491 is an apocalyptic number.

338390491 is a deficient number, since it is larger than the sum of its proper divisors (19905341).

338390491 is a wasteful number, since it uses less digits than its factorization.

338390491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19905340.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 338390491 is about 18395.3932004728. The cubic root of 338390491 is about 696.8501269947.

The spelling of 338390491 in words is "three hundred thirty-eight million, three hundred ninety thousand, four hundred ninety-one".