400444430 has 16 divisors (see below), whose sum is σ = 727799904. Its totient is φ = 158622240.

The previous prime is 400444411. The next prime is 400444433. The reversal of 400444430 is 34444004.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 400444396 and 400444405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400444433) 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, 193361 + ... + 195420.

It is an arithmetic number, because the mean of its divisors is an integer number (45487494).

Almost surely, 2^400444430 is an apocalyptic number.

400444430 is a deficient number, since it is larger than the sum of its proper divisors (327355474).

400444430 is a wasteful number, since it uses less digits than its factorization.

400444430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388891.

The product of its (nonzero) digits is 3072, while the sum is 23.

The square root of 400444430 is about 20011.1076654942. The cubic root of 400444430 is about 737.0790810793.

Adding to 400444430 its reverse (34444004), we get a palindrome (434888434).

The spelling of 400444430 in words is "four hundred million, four hundred forty-four thousand, four hundred thirty".