338921778 has 32 divisors (see below), whose sum is σ = 740892096. Its totient is φ = 102725568.

The previous prime is 338921773. The next prime is 338921797. The reversal of 338921778 is 877129833.

338921778 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×338921778² = 229735943205362568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (338921773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27201 + ... + 37652.

It is an arithmetic number, because the mean of its divisors is an integer number (23152878).

Almost surely, 2^338921778 is an apocalyptic number.

338921778 is an abundant number, since it is smaller than the sum of its proper divisors (401970318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

338921778 is a wasteful number, since it uses less digits than its factorization.

338921778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64938.

The product of its digits is 508032, while the sum is 48.

The square root of 338921778 is about 18409.8282990364. The cubic root of 338921778 is about 697.2146307605.

The spelling of 338921778 in words is "three hundred thirty-eight million, nine hundred twenty-one thousand, seven hundred seventy-eight".