400142020 has 48 divisors (see below), whose sum is σ = 863654400. Its totient is φ = 155652224.

The previous prime is 400142003. The next prime is 400142021. The reversal of 400142020 is 20241004.

It is a super-2 number, since 2×400142020² = 320227272339360800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (400142021) 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 15 ways as a sum of consecutive naturals, for example, 155706 + ... + 158254.

It is an arithmetic number, because the mean of its divisors is an integer number (17992800).

Almost surely, 2^400142020 is an apocalyptic number.

It is an amenable number.

400142020 is an abundant number, since it is smaller than the sum of its proper divisors (463512380).

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

400142020 is a wasteful number, since it uses less digits than its factorization.

400142020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2772 (or 2770 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 400142020 is about 20003.5501849047. The cubic root of 400142020 is about 736.8934904354.

Adding to 400142020 its reverse (20241004), we get a palindrome (420383024).

The spelling of 400142020 in words is "four hundred million, one hundred forty-two thousand, twenty".