721042338 has 16 divisors (see below), whose sum is σ = 1445027616. Its totient is φ = 239856960.

The previous prime is 721042337. The next prime is 721042351. The reversal of 721042338 is 833240127.

It is not an unprimeable number, because it can be changed into a prime (721042337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119431 + ... + 125322.

It is an arithmetic number, because the mean of its divisors is an integer number (90314226).

Almost surely, 2^721042338 is an apocalyptic number.

721042338 is an abundant number, since it is smaller than the sum of its proper divisors (723985278).

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

721042338 is a wasteful number, since it uses less digits than its factorization.

721042338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245249.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 721042338 is about 26852.2315273796. The cubic root of 721042338 is about 896.7132535845.

The spelling of 721042338 in words is "seven hundred twenty-one million, forty-two thousand, three hundred thirty-eight".