400021140 has 24 divisors (see below), whose sum is σ = 1120059360. Its totient is φ = 106672288.

The previous prime is 400021081. The next prime is 400021147. The reversal of 400021140 is 41120004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400021147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3333450 + ... + 3333569.

It is an arithmetic number, because the mean of its divisors is an integer number (46669140).

Almost surely, 2^400021140 is an apocalyptic number.

It is an amenable number.

400021140 is an abundant number, since it is smaller than the sum of its proper divisors (720038220).

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

400021140 is a wasteful number, since it uses less digits than its factorization.

400021140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667031 (or 6667029 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 400021140 is about 20000.5284930174. The cubic root of 400021140 is about 736.8192795704.

Adding to 400021140 its reverse (41120004), we get a palindrome (441141144).

The spelling of 400021140 in words is "four hundred million, twenty-one thousand, one hundred forty".