86436431 has 4 divisors (see below), whose sum is σ = 88275552. Its totient is φ = 84597312.

The previous prime is 86436397. The next prime is 86436433. The reversal of 86436431 is 13463468.

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

It is a cyclic number.

It is not a de Polignac number, because 86436431 - 2⁶ = 86436367 is a prime.

It is a super-2 number, since 2×86436431² = 14942513208035522, 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 = 86436391 and 86436400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86436433) 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, 919490 + ... + 919583.

It is an arithmetic number, because the mean of its divisors is an integer number (22068888).

Almost surely, 2^86436431 is an apocalyptic number.

86436431 is a deficient number, since it is larger than the sum of its proper divisors (1839121).

86436431 is a wasteful number, since it uses less digits than its factorization.

86436431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839120.

The product of its digits is 41472, while the sum is 35.

The square root of 86436431 is about 9297.1195001463. The cubic root of 86436431 is about 442.1459067313.

Adding to 86436431 its reverse (13463468), we get a palindrome (99899899).

The spelling of 86436431 in words is "eighty-six million, four hundred thirty-six thousand, four hundred thirty-one".