400378566 has 16 divisors (see below), whose sum is σ = 915151104. Its totient is φ = 114393864.

The previous prime is 400378541. The next prime is 400378567. The reversal of 400378566 is 665873004.

It is a super-2 number, since 2×400378566² = 320605992224432712, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400378567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4766370 + ... + 4766453.

It is an arithmetic number, because the mean of its divisors is an integer number (57196944).

Almost surely, 2^400378566 is an apocalyptic number.

400378566 is an abundant number, since it is smaller than the sum of its proper divisors (514772538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400378566 is a wasteful number, since it uses less digits than its factorization.

400378566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9532835.

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 400378566 is about 20009.4619118056. The cubic root of 400378566 is about 737.0386679493.

The spelling of 400378566 in words is "four hundred million, three hundred seventy-eight thousand, five hundred sixty-six".