400040011 has 4 divisors (see below), whose sum is σ = 457188592. Its totient is φ = 342891432.

The previous prime is 400039999. The next prime is 400040021. The reversal of 400040011 is 110040004.

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

It is a cyclic number.

It is not a de Polignac number, because 400040011 - 2¹⁹ = 399515723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400040011.

It is not an unprimeable number, because it can be changed into a prime (400040021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28574280 + ... + 28574293.

It is an arithmetic number, because the mean of its divisors is an integer number (114297148).

Almost surely, 2^400040011 is an apocalyptic number.

400040011 is a deficient number, since it is larger than the sum of its proper divisors (57148581).

400040011 is an equidigital number, since it uses as much as digits as its factorization.

400040011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57148580.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 400040011 is about 20001.0002499875. Note that the first 3 decimals coincide. The cubic root of 400040011 is about 736.8308658730.

Subtracting from 400040011 its sum of digits (10), we obtain a square (400040001 = 20001²).

Adding to 400040011 its reverse (110040004), we get a palindrome (510080015).

The spelling of 400040011 in words is "four hundred million, forty thousand, eleven".