139984 has 20 divisors (see below), whose sum is σ = 292516. Its totient is φ = 64512.

The previous prime is 139981. The next prime is 139987. The reversal of 139984 is 489931.

It is an interprime number because it is at equal distance from previous prime (139981) and next prime (139987).

It can be written as a sum of positive squares in 2 ways, for example, as 32400 + 107584 = 180^2 + 328^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129 + ... + 544.

2¹³⁹⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

139984 is an abundant number, since it is smaller than the sum of its proper divisors (152532).

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

139984 is a wasteful number, since it uses less digits than its factorization.

139984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694 (or 688 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 139984 is about 374.1443571671. The cubic root of 139984 is about 51.9229628502.

The spelling of 139984 in words is "one hundred thirty-nine thousand, nine hundred eighty-four".