840404408044 has 24 divisors (see below), whose sum is σ = 1504532449728. Its totient is φ = 410568149760.

The previous prime is 840404408027. The next prime is 840404408101. The reversal of 840404408044 is 440804404048.

It is a junction number, because it is equal to n+sod(n) for n = 840404407988 and 840404408006.

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, 3657687 + ... + 3880654.

It is an arithmetic number, because the mean of its divisors is an integer number (62688852072).

Almost surely, 2^840404408044 is an apocalyptic number.

It is an amenable number.

840404408044 is a deficient number, since it is larger than the sum of its proper divisors (664128041684).

840404408044 is a wasteful number, since it uses less digits than its factorization.

840404408044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7538985 (or 7538983 counting only the distinct ones).

The product of its (nonzero) digits is 262144, while the sum is 40.

The spelling of 840404408044 in words is "eight hundred forty billion, four hundred four million, four hundred eight thousand, forty-four".