400205947 has 2 divisors, whose sum is σ = 400205948. Its totient is φ = 400205946.

The previous prime is 400205867. The next prime is 400205963. The reversal of 400205947 is 749502004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400205947 - 2¹¹ = 400203899 is a prime.

It is not a weakly prime, because it can be changed into another prime (400205977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200102973 + 200102974.

It is an arithmetic number, because the mean of its divisors is an integer number (200102974).

Almost surely, 2^400205947 is an apocalyptic number.

400205947 is a deficient number, since it is larger than the sum of its proper divisors (1).

400205947 is an equidigital number, since it uses as much as digits as its factorization.

400205947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 400205947 is about 20005.1480124492. The cubic root of 400205947 is about 736.9327305714.

The spelling of 400205947 in words is "four hundred million, two hundred five thousand, nine hundred forty-seven".