400662601 has 2 divisors, whose sum is σ = 400662602. Its totient is φ = 400662600.

The previous prime is 400662593. The next prime is 400662643. The reversal of 400662601 is 106266004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397603600 + 3059001 = 19940^2 + 1749^2 .

It is a cyclic number.

It is not a de Polignac number, because 400662601 - 2³ = 400662593 is a prime.

It is not a weakly prime, because it can be changed into another prime (400662401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200331300 + 200331301.

It is an arithmetic number, because the mean of its divisors is an integer number (200331301).

Almost surely, 2^400662601 is an apocalyptic number.

It is an amenable number.

400662601 is a deficient number, since it is larger than the sum of its proper divisors (1).

400662601 is an equidigital number, since it uses as much as digits as its factorization.

400662601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 400662601 is about 20016.5581706746. The cubic root of 400662601 is about 737.2129157830.

The spelling of 400662601 in words is "four hundred million, six hundred sixty-two thousand, six hundred one".