390922729 has 2 divisors, whose sum is σ = 390922730. Its totient is φ = 390922728.

The previous prime is 390922717. The next prime is 390922759. The reversal of 390922729 is 927229093.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 350625625 + 40297104 = 18725^2 + 6348^2 .

It is a cyclic number.

It is not a de Polignac number, because 390922729 - 2⁷ = 390922601 is a prime.

It is not a weakly prime, because it can be changed into another prime (390922759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195461364 + 195461365.

It is an arithmetic number, because the mean of its divisors is an integer number (195461365).

Almost surely, 2^390922729 is an apocalyptic number.

It is an amenable number.

390922729 is a deficient number, since it is larger than the sum of its proper divisors (1).

390922729 is an equidigital number, since it uses as much as digits as its factorization.

390922729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 390922729 is about 19771.7659555235. The cubic root of 390922729 is about 731.1901078958.

The spelling of 390922729 in words is "three hundred ninety million, nine hundred twenty-two thousand, seven hundred twenty-nine".