399534461 has 2 divisors, whose sum is σ = 399534462. Its totient is φ = 399534460.

The previous prime is 399534431. The next prime is 399534503. The reversal of 399534461 is 164435993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310816900 + 88717561 = 17630^2 + 9419^2 .

It is a cyclic number.

It is not a de Polignac number, because 399534461 - 2¹⁸ = 399272317 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399534431) by changing a digit.

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 as a sum of consecutive naturals, namely, 199767230 + 199767231.

It is an arithmetic number, because the mean of its divisors is an integer number (199767231).

Almost surely, 2^399534461 is an apocalyptic number.

It is an amenable number.

399534461 is a deficient number, since it is larger than the sum of its proper divisors (1).

399534461 is an equidigital number, since it uses as much as digits as its factorization.

399534461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 44.

The square root of 399534461 is about 19988.3581366755. The cubic root of 399534461 is about 736.5203453736.

The spelling of 399534461 in words is "three hundred ninety-nine million, five hundred thirty-four thousand, four hundred sixty-one".