400001000001 has 4 divisors (see below), whose sum is σ = 533334666672. Its totient is φ = 266667333332.

The previous prime is 400000999973. The next prime is 400001000011. The reversal of 400001000001 is 100000100004.

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 400001000001 - 2²² = 399996805697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400001000011) 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, 66666833331 + ... + 66666833336.

It is an arithmetic number, because the mean of its divisors is an integer number (133333666668).

Almost surely, 2^400001000001 is an apocalyptic number.

400001000001 is the 400001-st centered pentagonal number.

It is an amenable number.

400001000001 is a deficient number, since it is larger than the sum of its proper divisors (133333666671).

400001000001 is a wasteful number, since it uses less digits than its factorization.

400001000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133333666670.

The product of its (nonzero) digits is 4, while the sum is 6.

Adding to 400001000001 its reverse (100000100004), we get a palindrome (500001100005).

The spelling of 400001000001 in words is "four hundred billion, one million, one", and thus it is an aban number.