400755601 has 2 divisors, whose sum is σ = 400755602. Its totient is φ = 400755600.

The previous prime is 400755599. The next prime is 400755643. The reversal of 400755601 is 106557004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 247590225 + 153165376 = 15735^2 + 12376^2 .

It is a cyclic number.

It is not a de Polignac number, because 400755601 - 2¹ = 400755599 is a prime.

Together with 400755599, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 400755601.

It is not a weakly prime, because it can be changed into another prime (400755001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200377800 + 200377801.

It is an arithmetic number, because the mean of its divisors is an integer number (200377801).

Almost surely, 2^400755601 is an apocalyptic number.

It is an amenable number.

400755601 is a deficient number, since it is larger than the sum of its proper divisors (1).

400755601 is an equidigital number, since it uses as much as digits as its factorization.

400755601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 400755601 is about 20018.8811125897. The cubic root of 400755601 is about 737.2699508852.

The spelling of 400755601 in words is "four hundred million, seven hundred fifty-five thousand, six hundred one".