721412385 has 8 divisors (see below), whose sum is σ = 1154259840. Its totient is φ = 384753264.

The previous prime is 721412339. The next prime is 721412399. The reversal of 721412385 is 583214127.

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

It is not a de Polignac number, because 721412385 - 2²² = 717218081 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

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, 24047065 + ... + 24047094.

It is an arithmetic number, because the mean of its divisors is an integer number (144282480).

Almost surely, 2^721412385 is an apocalyptic number.

It is an amenable number.

721412385 is a deficient number, since it is larger than the sum of its proper divisors (432847455).

721412385 is a wasteful number, since it uses less digits than its factorization.

721412385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48094167.

The product of its digits is 13440, while the sum is 33.

The square root of 721412385 is about 26859.1210764612. The cubic root of 721412385 is about 896.8666284431.

The spelling of 721412385 in words is "seven hundred twenty-one million, four hundred twelve thousand, three hundred eighty-five".