400646142 has 64 divisors (see below), whose sum is σ = 979292160. Its totient is φ = 120642912.

The previous prime is 400646111. The next prime is 400646143. The reversal of 400646142 is 241646004.

400646142 is a `hidden beast` number, since 4 + 0 + 0 + 646 + 14 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400646143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26923 + ... + 39065.

It is an arithmetic number, because the mean of its divisors is an integer number (15301440).

Almost surely, 2^400646142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400646142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (489646080).

400646142 is an abundant number, since it is smaller than the sum of its proper divisors (578646018).

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

400646142 is a wasteful number, since it uses less digits than its factorization.

400646142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12214 (or 12208 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 400646142 is about 20016.1470318341. The cubic root of 400646142 is about 737.2028208773.

The spelling of 400646142 in words is "four hundred million, six hundred forty-six thousand, one hundred forty-two".