338940391 has 8 divisors (see below), whose sum is σ = 353808000. Its totient is φ = 324318720.

The previous prime is 338940379. The next prime is 338940401. The reversal of 338940391 is 193049833.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 338940391 - 2⁷ = 338940263 is a prime.

It is a super-2 number, since 2×338940391² = 229761177302465762, 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 (338940311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58666 + ... + 64183.

It is an arithmetic number, because the mean of its divisors is an integer number (44226000).

Almost surely, 2^338940391 is an apocalyptic number.

338940391 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

338940391 is a deficient number, since it is larger than the sum of its proper divisors (14867609).

338940391 is a wasteful number, since it uses less digits than its factorization.

338940391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122969.

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

The square root of 338940391 is about 18410.3338101187. Note that the first 3 decimals coincide. The cubic root of 338940391 is about 697.2273938022.

The spelling of 338940391 in words is "three hundred thirty-eight million, nine hundred forty thousand, three hundred ninety-one".