840392401 has 16 divisors (see below), whose sum is σ = 906854400. Its totient is φ = 776372688.

The previous prime is 840392393. The next prime is 840392407. The reversal of 840392401 is 104293048.

It is a cyclic number.

It is not a de Polignac number, because 840392401 - 2³ = 840392393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840392407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139416 + ... + 145318.

It is an arithmetic number, because the mean of its divisors is an integer number (56678400).

Almost surely, 2^840392401 is an apocalyptic number.

It is an amenable number.

840392401 is a deficient number, since it is larger than the sum of its proper divisors (66461999).

840392401 is a wasteful number, since it uses less digits than its factorization.

840392401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6108.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 840392401 is about 28989.5222623623. The cubic root of 840392401 is about 943.6856960353.

The spelling of 840392401 in words is "eight hundred forty million, three hundred ninety-two thousand, four hundred one".