338863991 has 4 divisors (see below), whose sum is σ = 353597232. Its totient is φ = 324130752.

The previous prime is 338863979. The next prime is 338863997. The reversal of 338863991 is 199368833.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199368833 = 173 ⋅1152421.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-338863991 is a prime.

It is a super-2 number, since 2×338863991² = 229657608792896162, 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 (338863997) 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, 7366586 + ... + 7366631.

It is an arithmetic number, because the mean of its divisors is an integer number (88399308).

Almost surely, 2^338863991 is an apocalyptic number.

338863991 is a deficient number, since it is larger than the sum of its proper divisors (14733241).

338863991 is a wasteful number, since it uses less digits than its factorization.

338863991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14733240.

The product of its digits is 839808, while the sum is 50.

The square root of 338863991 is about 18408.2587715406. The cubic root of 338863991 is about 697.1750029028.

The spelling of 338863991 in words is "three hundred thirty-eight million, eight hundred sixty-three thousand, nine hundred ninety-one".