400142144 has 28 divisors (see below), whose sum is σ = 794669988. Its totient is φ = 199910400.

The previous prime is 400142143. The next prime is 400142159. The reversal of 400142144 is 441241004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 178489600 + 221652544 = 13360^2 + 14888^2 .

It is a super-2 number, since 2×400142144² = 320227470809833472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400142143) 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, 144614 + ... + 147354.

It is an arithmetic number, because the mean of its divisors is an integer number (28381071).

Almost surely, 2^400142144 is an apocalyptic number.

It is an amenable number.

400142144 is a deficient number, since it is larger than the sum of its proper divisors (394527844).

400142144 is a wasteful number, since it uses less digits than its factorization.

400142144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5034 (or 5024 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 400142144 is about 20003.5532843543. The cubic root of 400142144 is about 736.8935665541.

Adding to 400142144 its reverse (441241004), we get a palindrome (841383148).

The spelling of 400142144 in words is "four hundred million, one hundred forty-two thousand, one hundred forty-four".