400008971 has 2 divisors, whose sum is σ = 400008972. Its totient is φ = 400008970.

The previous prime is 400008949. The next prime is 400008989. The reversal of 400008971 is 179800004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400008971 - 2¹⁰ = 400007947 is a prime.

It is not a weakly prime, because it can be changed into another prime (400008941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200004485 + 200004486.

It is an arithmetic number, because the mean of its divisors is an integer number (200004486).

Almost surely, 2^400008971 is an apocalyptic number.

400008971 is a deficient number, since it is larger than the sum of its proper divisors (1).

400008971 is an equidigital number, since it uses as much as digits as its factorization.

400008971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 400008971 is about 20000.2242737425. The cubic root of 400008971 is about 736.8118079280.

Adding to 400008971 its reverse (179800004), we get a palindrome (579808975).

The spelling of 400008971 in words is "four hundred million, eight thousand, nine hundred seventy-one".