400247244 has 108 divisors (see below), whose sum is σ = 1068024048. Its totient is φ = 131220000.

The previous prime is 400247191. The next prime is 400247249. The reversal of 400247244 is 442742004.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (400247249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2650569 + ... + 2650719.

Almost surely, 2^400247244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400247244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (534012024).

400247244 is an abundant number, since it is smaller than the sum of its proper divisors (667776804).

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

400247244 is a wasteful number, since it uses less digits than its factorization.

400247244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 27.

The square root of 400247244 is about 20006.1801451451. The cubic root of 400247244 is about 736.9580775745.

Adding to 400247244 its reverse (442742004), we get a palindrome (842989248).

The spelling of 400247244 in words is "four hundred million, two hundred forty-seven thousand, two hundred forty-four".