86139378 has 24 divisors (see below), whose sum is σ = 200992428. Its totient is φ = 26504352.

The previous prime is 86139353. The next prime is 86139379. The reversal of 86139378 is 87393168.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81486729 + 4652649 = 9027^2 + 2157^2 .

It is not an unprimeable number, because it can be changed into a prime (86139379) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183825 + ... + 184292.

Almost surely, 2^86139378 is an apocalyptic number.

86139378 is an abundant number, since it is smaller than the sum of its proper divisors (114853050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86139378 is a wasteful number, since it uses less digits than its factorization.

86139378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368138 (or 368135 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 86139378 is about 9281.1302113482. The cubic root of 86139378 is about 441.6388230380.

The spelling of 86139378 in words is "eighty-six million, one hundred thirty-nine thousand, three hundred seventy-eight".