139387284 has 144 divisors (see below), whose sum is σ = 400377600. Its totient is φ = 41783040.

The previous prime is 139387243. The next prime is 139387309. The reversal of 139387284 is 482783931.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1764357 + ... + 1764435.

It is an arithmetic number, because the mean of its divisors is an integer number (2780400).

Almost surely, 2^139387284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139387284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200188800).

139387284 is an abundant number, since it is smaller than the sum of its proper divisors (260990316).

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

139387284 is a wasteful number, since it uses less digits than its factorization.

139387284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171 (or 132 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 139387284 is about 11806.2391979834. The cubic root of 139387284 is about 518.4907966391.

The spelling of 139387284 in words is "one hundred thirty-nine million, three hundred eighty-seven thousand, two hundred eighty-four".