400640453 has 2 divisors, whose sum is σ = 400640454. Its totient is φ = 400640452.

The previous prime is 400640447. The next prime is 400640467. The reversal of 400640453 is 354046004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 274796929 + 125843524 = 16577^2 + 11218^2 .

It is a cyclic number.

It is not a de Polignac number, because 400640453 - 2¹⁶ = 400574917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400640153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200320226 + 200320227.

It is an arithmetic number, because the mean of its divisors is an integer number (200320227).

Almost surely, 2^400640453 is an apocalyptic number.

It is an amenable number.

400640453 is a deficient number, since it is larger than the sum of its proper divisors (1).

400640453 is an equidigital number, since it uses as much as digits as its factorization.

400640453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 400640453 is about 20016.0049210625. The cubic root of 400640453 is about 737.1993315416.

Adding to 400640453 its reverse (354046004), we get a palindrome (754686457).

The spelling of 400640453 in words is "four hundred million, six hundred forty thousand, four hundred fifty-three".