338929721 has 8 divisors (see below), whose sum is σ = 366322824. Its totient is φ = 311725440.

The previous prime is 338929709. The next prime is 338929763. The reversal of 338929721 is 127929833.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 774400 + 338155321 = 880^2 + 18389^2 .

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

It is not a de Polignac number, because 338929721 - 2¹⁸ = 338667577 is a prime.

It is a super-2 number, since 2×338929721² = 229746711554275682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (338929021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43460 + ... + 50661.

It is an arithmetic number, because the mean of its divisors is an integer number (45790353).

Almost surely, 2^338929721 is an apocalyptic number.

It is an amenable number.

338929721 is a deficient number, since it is larger than the sum of its proper divisors (27393103).

338929721 is a wasteful number, since it uses less digits than its factorization.

338929721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94411.

The product of its digits is 163296, while the sum is 44.

The square root of 338929721 is about 18410.0440249338. The cubic root of 338929721 is about 697.2200773787.

The spelling of 338929721 in words is "three hundred thirty-eight million, nine hundred twenty-nine thousand, seven hundred twenty-one".