400047929 has 2 divisors, whose sum is σ = 400047930. Its totient is φ = 400047928.

The previous prime is 400047917. The next prime is 400047997. The reversal of 400047929 is 929740004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 353440000 + 46607929 = 18800^2 + 6827^2 .

It is a cyclic number.

It is not a de Polignac number, because 400047929 - 2⁴ = 400047913 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (400047029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200023964 + 200023965.

It is an arithmetic number, because the mean of its divisors is an integer number (200023965).

Almost surely, 2^400047929 is an apocalyptic number.

It is an amenable number.

400047929 is a deficient number, since it is larger than the sum of its proper divisors (1).

400047929 is an equidigital number, since it uses as much as digits as its factorization.

400047929 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 400047929 is about 20001.1981891086. The cubic root of 400047929 is about 736.8357272104.

The spelling of 400047929 in words is "four hundred million, forty-seven thousand, nine hundred twenty-nine".