400402011 has 16 divisors (see below), whose sum is σ = 541205280. Its totient is φ = 263281920.

The previous prime is 400401973. The next prime is 400402021. The reversal of 400402011 is 110204004.

It is not a de Polignac number, because 400402011 - 2¹⁷ = 400270939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400402021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121461 + ... + 124713.

It is an arithmetic number, because the mean of its divisors is an integer number (33825330).

Almost surely, 2^400402011 is an apocalyptic number.

400402011 is a deficient number, since it is larger than the sum of its proper divisors (140803269).

400402011 is a wasteful number, since it uses less digits than its factorization.

400402011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3806.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 400402011 is about 20010.0477510675. The cubic root of 400402011 is about 737.0530539461.

Adding to 400402011 its reverse (110204004), we get a palindrome (510606015).

The spelling of 400402011 in words is "four hundred million, four hundred two thousand, eleven".