400440344644 has 24 divisors (see below), whose sum is σ = 706186027008. Its totient is φ = 198673194720.

The previous prime is 400440344599. The next prime is 400440344659. The reversal of 400440344644 is 446443044004.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6831549 + ... + 6889915.

It is an arithmetic number, because the mean of its divisors is an integer number (29424417792).

Almost surely, 2^400440344644 is an apocalyptic number.

It is an amenable number.

400440344644 is a deficient number, since it is larger than the sum of its proper divisors (305745682364).

400440344644 is a wasteful number, since it uses less digits than its factorization.

400440344644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71595 (or 71593 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 37.

Adding to 400440344644 its reverse (446443044004), we get a palindrome (846883388648).

The spelling of 400440344644 in words is "four hundred billion, four hundred forty million, three hundred forty-four thousand, six hundred forty-four".