400401044 has 12 divisors (see below), whose sum is σ = 701443764. Its totient is φ = 199988544.

The previous prime is 400401031. The next prime is 400401049. The reversal of 400401044 is 440104004.

It can be written as a sum of positive squares in 2 ways, for example, as 68724100 + 331676944 = 8290^2 + 18212^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400401049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48707 + ... + 56330.

It is an arithmetic number, because the mean of its divisors is an integer number (58453647).

Almost surely, 2^400401044 is an apocalyptic number.

It is an amenable number.

400401044 is a deficient number, since it is larger than the sum of its proper divisors (301042720).

400401044 is a wasteful number, since it uses less digits than its factorization.

400401044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105994 (or 105992 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 400401044 is about 20010.0235881920. The cubic root of 400401044 is about 737.0524606000.

Adding to 400401044 its reverse (440104004), we get a palindrome (840505048).

The spelling of 400401044 in words is "four hundred million, four hundred one thousand, forty-four".