86439478 has 4 divisors (see below), whose sum is σ = 129659220. Its totient is φ = 43219738.

The previous prime is 86439473. The next prime is 86439481. The reversal of 86439478 is 87493468.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86439473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21609868 + ... + 21609871.

It is an arithmetic number, because the mean of its divisors is an integer number (32414805).

Almost surely, 2^86439478 is an apocalyptic number.

86439478 is a deficient number, since it is larger than the sum of its proper divisors (43219742).

86439478 is a wasteful number, since it uses less digits than its factorization.

86439478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43219741.

The product of its digits is 1161216, while the sum is 49.

The square root of 86439478 is about 9297.2833666615. The cubic root of 86439478 is about 442.1511020821.

The spelling of 86439478 in words is "eighty-six million, four hundred thirty-nine thousand, four hundred seventy-eight".