338607721 has 8 divisors (see below), whose sum is σ = 356742080. Its totient is φ = 320504688.

The previous prime is 338607719. The next prime is 338607743. The reversal of 338607721 is 127706833.

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 338607721 - 2¹ = 338607719 is a prime.

It is a super-2 number, since 2×338607721² = 229310377441627682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (338607701) 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, 16300 + ... + 30706.

It is an arithmetic number, because the mean of its divisors is an integer number (44592760).

Almost surely, 2^338607721 is an apocalyptic number.

It is an amenable number.

338607721 is a deficient number, since it is larger than the sum of its proper divisors (18134359).

338607721 is a wasteful number, since it uses less digits than its factorization.

338607721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15663.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 338607721 is about 18401.2967206118. The cubic root of 338607721 is about 696.9992095650. Note that the first 3 decimals are identical.

The spelling of 338607721 in words is "three hundred thirty-eight million, six hundred seven thousand, seven hundred twenty-one".