84001431 has 4 divisors (see below), whose sum is σ = 112001912. Its totient is φ = 56000952.

The previous prime is 84001399. The next prime is 84001439. The reversal of 84001431 is 13410048.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 84001431 - 2⁵ = 84001399 is a prime.

It is a super-2 number, since 2×84001431² = 14112480820095522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84001398 and 84001407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84001439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14000236 + ... + 14000241.

It is an arithmetic number, because the mean of its divisors is an integer number (28000478).

Almost surely, 2^84001431 is an apocalyptic number.

84001431 is a deficient number, since it is larger than the sum of its proper divisors (28000481).

84001431 is a wasteful number, since it uses less digits than its factorization.

84001431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28000480.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 84001431 is about 9165.2294570294. The cubic root of 84001431 is about 437.9544009159.

Adding to 84001431 its reverse (13410048), we get a palindrome (97411479).

The spelling of 84001431 in words is "eighty-four million, one thousand, four hundred thirty-one".