840400004 has 12 divisors (see below), whose sum is σ = 1474115328. Its totient is φ = 419224200.

The previous prime is 840400003. The next prime is 840400037. The reversal of 840400004 is 400004048.

It is not an unprimeable number, because it can be changed into a prime (840400003) 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, 242012 + ... + 245459.

It is an arithmetic number, because the mean of its divisors is an integer number (122842944).

Almost surely, 2^840400004 is an apocalyptic number.

It is an amenable number.

840400004 is a deficient number, since it is larger than the sum of its proper divisors (633715324).

840400004 is a wasteful number, since it uses less digits than its factorization.

840400004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487906 (or 487904 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 840400004 is about 28989.6533956514. The cubic root of 840400004 is about 943.6885418570.

The spelling of 840400004 in words is "eight hundred forty million, four hundred thousand, four".