139145688 has 144 divisors (see below), whose sum is σ = 428673960. Its totient is φ = 41990400.

The previous prime is 139145647. The next prime is 139145693. The reversal of 139145688 is 886541931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 577248 + ... + 577488.

Almost surely, 2^139145688 is an apocalyptic number.

139145688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139145688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214336980).

139145688 is an abundant number, since it is smaller than the sum of its proper divisors (289528272).

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

139145688 is an equidigital number, since it uses as much as digits as its factorization.

139145688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 257 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 139145688 is about 11796.0030518816. The cubic root of 139145688 is about 518.1910616331.

The spelling of 139145688 in words is "one hundred thirty-nine million, one hundred forty-five thousand, six hundred eighty-eight".