507478729 has 2 divisors, whose sum is σ = 507478730. Its totient is φ = 507478728.

The previous prime is 507478721. The next prime is 507478753. The reversal of 507478729 is 927874705.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 507150400 + 328329 = 22520^2 + 573^2 .

It is a cyclic number.

It is not a de Polignac number, because 507478729 - 2³ = 507478721 is a prime.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (507478721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253739364 + 253739365.

It is an arithmetic number, because the mean of its divisors is an integer number (253739365).

Almost surely, 2^507478729 is an apocalyptic number.

It is an amenable number.

507478729 is a deficient number, since it is larger than the sum of its proper divisors (1).

507478729 is an equidigital number, since it uses as much as digits as its factorization.

507478729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 987840, while the sum is 49.

The square root of 507478729 is about 22527.2885407898. The cubic root of 507478729 is about 797.6382056249.

The spelling of 507478729 in words is "five hundred seven million, four hundred seventy-eight thousand, seven hundred twenty-nine".