139435423218 has 672 divisors, whose sum is σ = 422012021760. Its totient is φ = 34154991360.

The previous prime is 139435423217. The next prime is 139435423229. The reversal of 139435423218 is 812324534931.

It is a happy number.

139435423218 is a `hidden beast` number, since 1 + 3 + 9 + 4 + 3 + 5 + 423 + 218 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139435423213) by changing a digit.

It is a polite number, since it can be written in 335 ways as a sum of consecutive naturals, for example, 834942571 + ... + 834942737.

It is an arithmetic number, because the mean of its divisors is an integer number (627994080).

Almost surely, 2^139435423218 is an apocalyptic number.

139435423218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139435423218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211006010880).

139435423218 is an abundant number, since it is smaller than the sum of its proper divisors (282576598542).

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

139435423218 is a wasteful number, since it uses less digits than its factorization.

139435423218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 252 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 139435423218 in words is "one hundred thirty-nine billion, four hundred thirty-five million, four hundred twenty-three thousand, two hundred eighteen".