400053781243 has 4 divisors (see below), whose sum is σ = 401610411000. Its totient is φ = 398497151488.

The previous prime is 400053781207. The next prime is 400053781301. The reversal of 400053781243 is 342187350004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400053781243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400053781643) 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, 778314493 + ... + 778315006.

It is an arithmetic number, because the mean of its divisors is an integer number (100402602750).

Almost surely, 2^400053781243 is an apocalyptic number.

400053781243 is a deficient number, since it is larger than the sum of its proper divisors (1556629757).

400053781243 is a wasteful number, since it uses less digits than its factorization.

400053781243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556629756.

The product of its (nonzero) digits is 80640, while the sum is 37.

The spelling of 400053781243 in words is "four hundred billion, fifty-three million, seven hundred eighty-one thousand, two hundred forty-three".