390234721 has 8 divisors (see below), whose sum is σ = 410313024. Its totient is φ = 370415760.

The previous prime is 390234683. The next prime is 390234743. The reversal of 390234721 is 127432093.

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 390234721 - 2⁹ = 390234209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390234781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61746 + ... + 67771.

It is an arithmetic number, because the mean of its divisors is an integer number (51289128).

Almost surely, 2^390234721 is an apocalyptic number.

It is an amenable number.

390234721 is a deficient number, since it is larger than the sum of its proper divisors (20078303).

390234721 is a wasteful number, since it uses less digits than its factorization.

390234721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129671.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 390234721 is about 19754.3595441614. The cubic root of 390234721 is about 730.7609011159.

The spelling of 390234721 in words is "three hundred ninety million, two hundred thirty-four thousand, seven hundred twenty-one".