400243435253 has 4 divisors (see below), whose sum is σ = 402038249088. Its totient is φ = 398448621420.

The previous prime is 400243435213. The next prime is 400243435307. The reversal of 400243435253 is 352534342004.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400243435253 - 2¹⁰ = 400243434229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400243435213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897406583 + ... + 897407028.

It is an arithmetic number, because the mean of its divisors is an integer number (100509562272).

Almost surely, 2^400243435253 is an apocalyptic number.

It is an amenable number.

400243435253 is a deficient number, since it is larger than the sum of its proper divisors (1794813835).

400243435253 is a wasteful number, since it uses less digits than its factorization.

400243435253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794813834.

The product of its (nonzero) digits is 172800, while the sum is 35.

Adding to 400243435253 its reverse (352534342004), we get a palindrome (752777777257).

The spelling of 400243435253 in words is "four hundred billion, two hundred forty-three million, four hundred thirty-five thousand, two hundred fifty-three".