840086401 has 16 divisors (see below), whose sum is σ = 1063019520. Its totient is φ = 644838480.

The previous prime is 840086381. The next prime is 840086407. The reversal of 840086401 is 104680048.

It is not a de Polignac number, because 840086401 - 2²⁷ = 705868673 is a prime.

It is a super-2 number, since 2×840086401² = 1411490322290265602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840086407) 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, 76261 + ... + 86578.

It is an arithmetic number, because the mean of its divisors is an integer number (66438720).

Almost surely, 2^840086401 is an apocalyptic number.

It is an amenable number.

840086401 is a deficient number, since it is larger than the sum of its proper divisors (222933119).

840086401 is a wasteful number, since it uses less digits than its factorization.

840086401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162924.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 840086401 is about 28984.2440129116. The cubic root of 840086401 is about 943.5711452302.

It can be divided in two parts, 84008 and 6401, that added together give a palindrome (90409).

The spelling of 840086401 in words is "eight hundred forty million, eighty-six thousand, four hundred one".