400423122013 has 4 divisors (see below), whose sum is σ = 401191688988. Its totient is φ = 399654555040.

The previous prime is 400423121999. The next prime is 400423122053. The reversal of 400423122013 is 310221324004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42457838809 + 357965283204 = 206053^2 + 598302^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400423122013 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 (400423122053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 384282706 + ... + 384283747.

It is an arithmetic number, because the mean of its divisors is an integer number (100297922247).

Almost surely, 2^400423122013 is an apocalyptic number.

It is an amenable number.

400423122013 is a deficient number, since it is larger than the sum of its proper divisors (768566975).

400423122013 is an equidigital number, since it uses as much as digits as its factorization.

400423122013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768566974.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 400423122013 its reverse (310221324004), we get a palindrome (710644446017).

The spelling of 400423122013 in words is "four hundred billion, four hundred twenty-three million, one hundred twenty-two thousand, thirteen".