338145721 has 8 divisors (see below), whose sum is σ = 339978240. Its totient is φ = 336318912.

The previous prime is 338145719. The next prime is 338145727. The reversal of 338145721 is 127541833.

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 338145721 - 2¹ = 338145719 is a prime.

It is a super-2 number, since 2×338145721² = 228685057261219682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (338145727) 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, 164820 + ... + 166858.

It is an arithmetic number, because the mean of its divisors is an integer number (42497280).

Almost surely, 2^338145721 is an apocalyptic number.

It is an amenable number.

338145721 is a deficient number, since it is larger than the sum of its proper divisors (1832519).

338145721 is a wasteful number, since it uses less digits than its factorization.

338145721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2855.

The product of its digits is 20160, while the sum is 34.

The square root of 338145721 is about 18388.7389725343. The cubic root of 338145721 is about 696.6820675558.

The spelling of 338145721 in words is "three hundred thirty-eight million, one hundred forty-five thousand, seven hundred twenty-one".