400020142 has 32 divisors (see below), whose sum is σ = 641520000. Its totient is φ = 186734688.

The previous prime is 400020139. The next prime is 400020157. The reversal of 400020142 is 241020004.

It is a super-2 number, since 2×400020142² = 320032228011400328, which contains 22 as substring.

It is a congruent number.

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, 266109 + ... + 267607.

It is an arithmetic number, because the mean of its divisors is an integer number (20047500).

Almost surely, 2^400020142 is an apocalyptic number.

400020142 is a deficient number, since it is larger than the sum of its proper divisors (241499858).

400020142 is a wasteful number, since it uses less digits than its factorization.

400020142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680.

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

The square root of 400020142 is about 20000.5035436611. The cubic root of 400020142 is about 736.8186668142.

Adding to 400020142 its reverse (241020004), we get a palindrome (641040146).

It can be divided in two parts, 4000 and 20142, that added together give a palindrome (24142).

The spelling of 400020142 in words is "four hundred million, twenty thousand, one hundred forty-two".