839840401 has 8 divisors (see below), whose sum is σ = 850762440. Its totient is φ = 828951552.

The previous prime is 839840387. The next prime is 839840429. The reversal of 839840401 is 104048938.

It is a Cunningham number, because it is equal to 28980²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 161290000 + 678550401 = 12700^2 + 26049^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 839840401 - 2⁵ = 839840369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (839840431) 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, 44821 + ... + 60733.

It is an arithmetic number, because the mean of its divisors is an integer number (106345305).

Almost surely, 2^839840401 is an apocalyptic number.

It is an amenable number.

839840401 is a deficient number, since it is larger than the sum of its proper divisors (10922039).

839840401 is a wasteful number, since it uses less digits than its factorization.

839840401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16595.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 839840401 is about 28980.0000172533. Note that the first 4 decimals coincide. The cubic root of 839840401 is about 943.4790351957.

The spelling of 839840401 in words is "eight hundred thirty-nine million, eight hundred forty thousand, four hundred one".