399791461 has 2 divisors, whose sum is σ = 399791462. Its totient is φ = 399791460.

The previous prime is 399791443. The next prime is 399791467. The reversal of 399791461 is 164197993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281199361 + 118592100 = 16769^2 + 10890^2 .

It is a cyclic number.

It is not a de Polignac number, because 399791461 - 2¹⁹ = 399267173 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399791467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199895730 + 199895731.

It is an arithmetic number, because the mean of its divisors is an integer number (199895731).

Almost surely, 2^399791461 is an apocalyptic number.

It is an amenable number.

399791461 is a deficient number, since it is larger than the sum of its proper divisors (1).

399791461 is an equidigital number, since it uses as much as digits as its factorization.

399791461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 49.

The square root of 399791461 is about 19994.7858453148. The cubic root of 399791461 is about 736.6782334290.

The spelling of 399791461 in words is "three hundred ninety-nine million, seven hundred ninety-one thousand, four hundred sixty-one".