400047997 has 2 divisors, whose sum is σ = 400047998. Its totient is φ = 400047996.

The previous prime is 400047929. The next prime is 400048003. The reversal of 400047997 is 799740004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 300467556 + 99580441 = 17334^2 + 9979^2 .

It is a cyclic number.

It is not a de Polignac number, because 400047997 - 2¹¹ = 400045949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400047917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200023998 + 200023999.

It is an arithmetic number, because the mean of its divisors is an integer number (200023999).

Almost surely, 2^400047997 is an apocalyptic number.

It is an amenable number.

400047997 is a deficient number, since it is larger than the sum of its proper divisors (1).

400047997 is an equidigital number, since it uses as much as digits as its factorization.

400047997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 400047997 is about 20001.1998890067. The cubic root of 400047997 is about 736.8357689594.

The spelling of 400047997 in words is "four hundred million, forty-seven thousand, nine hundred ninety-seven".