400040382 has 32 divisors (see below), whose sum is σ = 914976000. Its totient is φ = 114222528.

The previous prime is 400040363. The next prime is 400040387. The reversal of 400040382 is 283040004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111594 + ... + 115122.

It is an arithmetic number, because the mean of its divisors is an integer number (28593000).

Almost surely, 2^400040382 is an apocalyptic number.

400040382 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

400040382 is an abundant number, since it is smaller than the sum of its proper divisors (514935618).

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

400040382 is a wasteful number, since it uses less digits than its factorization.

400040382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6240.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 400040382 is about 20001.0095245215. The cubic root of 400040382 is about 736.8310936537.

Adding to 400040382 its reverse (283040004), we get a palindrome (683080386).

The spelling of 400040382 in words is "four hundred million, forty thousand, three hundred eighty-two".