400240000 has 80 divisors (see below), whose sum is σ = 996571620. Its totient is φ = 160064000.

The previous prime is 400239967. The next prime is 400240003. The reversal of 400240000 is 42004.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400240003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 77499 + ... + 82501.

Almost surely, 2^400240000 is an apocalyptic number.

400240000 is a gapful number since it is divisible by the number (40) 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 400240000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (498285810).

400240000 is an abundant number, since it is smaller than the sum of its proper divisors (596331620).

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

400240000 is an frugal number, since it uses more digits than its factorization.

400240000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5037 (or 5010 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 400240000 is about 20005.9991002699. Note that the first 3 decimals coincide. The cubic root of 400240000 is about 736.9536315256.

Adding to 400240000 its reverse (42004), we get a palindrome (400282004).

The spelling of 400240000 in words is "four hundred million, two hundred forty thousand".