400203240 has 64 divisors (see below), whose sum is σ = 1209297600. Its totient is φ = 105948672.

The previous prime is 400203217. The next prime is 400203253. The reversal of 400203240 is 42302004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4684 + ... + 28676.

It is an arithmetic number, because the mean of its divisors is an integer number (18895275).

Almost surely, 2^400203240 is an apocalyptic number.

400203240 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 400203240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (604648800).

400203240 is an abundant number, since it is smaller than the sum of its proper divisors (809094360).

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

400203240 is a wasteful number, since it uses less digits than its factorization.

400203240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24146 (or 24142 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 400203240 is about 20005.0803547499. The cubic root of 400203240 is about 736.9310690257.

Adding to 400203240 its reverse (42302004), we get a palindrome (442505244).

The spelling of 400203240 in words is "four hundred million, two hundred three thousand, two hundred forty".