400203253 has 2 divisors, whose sum is σ = 400203254. Its totient is φ = 400203252.

The previous prime is 400203217. The next prime is 400203257. The reversal of 400203253 is 352302004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 372567204 + 27636049 = 19302^2 + 5257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400203253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400203253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400203257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200101626 + 200101627.

It is an arithmetic number, because the mean of its divisors is an integer number (200101627).

Almost surely, 2^400203253 is an apocalyptic number.

It is an amenable number.

400203253 is a deficient number, since it is larger than the sum of its proper divisors (1).

400203253 is an equidigital number, since it uses as much as digits as its factorization.

400203253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 400203253 is about 20005.0806796674. The cubic root of 400203253 is about 736.9310770050.

Adding to 400203253 its reverse (352302004), we get a palindrome (752505257).

The spelling of 400203253 in words is "four hundred million, two hundred three thousand, two hundred fifty-three".