390722729 has 4 divisors (see below), whose sum is σ = 403326720. Its totient is φ = 378118740.

The previous prime is 390722711. The next prime is 390722737. The reversal of 390722729 is 927227093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390722729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390722329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6301949 + ... + 6302010.

It is an arithmetic number, because the mean of its divisors is an integer number (100831680).

Almost surely, 2^390722729 is an apocalyptic number.

It is an amenable number.

390722729 is a deficient number, since it is larger than the sum of its proper divisors (12603991).

390722729 is a wasteful number, since it uses less digits than its factorization.

390722729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12603990.

The product of its (nonzero) digits is 95256, while the sum is 41.

The square root of 390722729 is about 19766.7075913011. The cubic root of 390722729 is about 731.0653918869.

The spelling of 390722729 in words is "three hundred ninety million, seven hundred twenty-two thousand, seven hundred twenty-nine".