139987284 has 24 divisors (see below), whose sum is σ = 334604928. Its totient is φ = 45524160.

The previous prime is 139987277. The next prime is 139987303. The reversal of 139987284 is 482789931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 141772 + ... + 142755.

It is an arithmetic number, because the mean of its divisors is an integer number (13941872).

Almost surely, 2^139987284 is an apocalyptic number.

It is an amenable number.

139987284 is an abundant number, since it is smaller than the sum of its proper divisors (194617644).

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

139987284 is a wasteful number, since it uses less digits than its factorization.

139987284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284575 (or 284573 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 139987284 is about 11831.6222049219. The cubic root of 139987284 is about 519.2336888151.

The spelling of 139987284 in words is "one hundred thirty-nine million, nine hundred eighty-seven thousand, two hundred eighty-four".