400520134109 has 4 divisors (see below), whose sum is σ = 401127904320. Its totient is φ = 399912363900.

The previous prime is 400520134051. The next prime is 400520134111. The reversal of 400520134109 is 901431025004.

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 400520134109 - 2¹² = 400520130013 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 (400520134129) 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, 303884117 + ... + 303885434.

It is an arithmetic number, because the mean of its divisors is an integer number (100281976080).

Almost surely, 2^400520134109 is an apocalyptic number.

It is an amenable number.

400520134109 is a deficient number, since it is larger than the sum of its proper divisors (607770211).

400520134109 is an equidigital number, since it uses as much as digits as its factorization.

400520134109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607770210.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 400520134109 in words is "four hundred billion, five hundred twenty million, one hundred thirty-four thousand, one hundred nine".