400040124 has 96 divisors (see below), whose sum is σ = 1101413376. Its totient is φ = 111636480.

The previous prime is 400040101. The next prime is 400040129. The reversal of 400040124 is 421040004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040129) 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, 103572 + ... + 107364.

It is an arithmetic number, because the mean of its divisors is an integer number (11473056).

Almost surely, 2^400040124 is an apocalyptic number.

400040124 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400040124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (550706688).

400040124 is an abundant number, since it is smaller than the sum of its proper divisors (701373252).

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

400040124 is a wasteful number, since it uses less digits than its factorization.

400040124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3875 (or 3873 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 400040124 is about 20001.0030748460. The cubic root of 400040124 is about 736.8309352510.

Adding to 400040124 its reverse (421040004), we get a palindrome (821080128).

The spelling of 400040124 in words is "four hundred million, forty thousand, one hundred twenty-four".