400023144 has 64 divisors (see below), whose sum is σ = 1112832000. Its totient is φ = 133142400.

The previous prime is 400023139. The next prime is 400023161. The reversal of 400023144 is 441320004.

It is a super-3 number, since 3×400023144³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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, 247812 + ... + 249420.

It is an arithmetic number, because the mean of its divisors is an integer number (17388000).

Almost surely, 2^400023144 is an apocalyptic number.

It is an amenable number.

400023144 is an abundant number, since it is smaller than the sum of its proper divisors (712808856).

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

400023144 is a wasteful number, since it uses less digits than its factorization.

400023144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775 (or 2765 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 400023144 is about 20000.5785916308. The cubic root of 400023144 is about 736.8205099915.

Adding to 400023144 its reverse (441320004), we get a palindrome (841343148).

The spelling of 400023144 in words is "four hundred million, twenty-three thousand, one hundred forty-four".