400443444 has 36 divisors (see below), whose sum is σ = 1012851840. Its totient is φ = 133399440.

The previous prime is 400443427. The next prime is 400443457. The reversal of 400443444 is 444344004.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×400443444² = 320709903685162272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95839 + ... + 99929.

Almost surely, 2^400443444 is an apocalyptic number.

It is an amenable number.

400443444 is an abundant number, since it is smaller than the sum of its proper divisors (612408396).

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

400443444 is a wasteful number, since it uses less digits than its factorization.

400443444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6820 (or 6815 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 27.

The square root of 400443444 is about 20011.0830291616. The cubic root of 400443444 is about 737.0784761177.

Adding to 400443444 its reverse (444344004), we get a palindrome (844787448).

The spelling of 400443444 in words is "four hundred million, four hundred forty-three thousand, four hundred forty-four".