400497668 has 6 divisors (see below), whose sum is σ = 700870926. Its totient is φ = 200248832.

The previous prime is 400497667. The next prime is 400497677. The reversal of 400497668 is 866794004.

It can be written as a sum of positive squares in only one way, i.e., 337897924 + 62599744 = 18382^2 + 7912^2 .

It is not an unprimeable number, because it can be changed into a prime (400497661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50062205 + ... + 50062212.

It is an arithmetic number, because the mean of its divisors is an integer number (116811821).

Almost surely, 2^400497668 is an apocalyptic number.

It is an amenable number.

400497668 is a deficient number, since it is larger than the sum of its proper divisors (300373258).

400497668 is a wasteful number, since it uses less digits than its factorization.

400497668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100124421 (or 100124419 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 400497668 is about 20012.4378325081. The cubic root of 400497668 is about 737.1117438529. Note that the first 3 decimals are identical.

The spelling of 400497668 in words is "four hundred million, four hundred ninety-seven thousand, six hundred sixty-eight".