400044440 has 32 divisors (see below), whose sum is σ = 902286000. Its totient is φ = 159629184.

The previous prime is 400044419. The next prime is 400044443. The reversal of 400044440 is 44440004.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400044443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4826 + ... + 28694.

Almost surely, 2^400044440 is an apocalyptic number.

400044440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400044440 is an abundant number, since it is smaller than the sum of its proper divisors (502241560).

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

400044440 is a wasteful number, since it uses less digits than its factorization.

400044440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24299 (or 24295 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 400044440 is about 20001.1109691437. The cubic root of 400044440 is about 736.8335851109.

Adding to 400044440 its reverse (44440004), we get a palindrome (444484444).

It can be divided in two parts, 40004 and 4440, that added together give a palindrome (44444).

The spelling of 400044440 in words is "four hundred million, forty-four thousand, four hundred forty".