139940 has 12 divisors (see below), whose sum is σ = 293916. Its totient is φ = 55968.

The previous prime is 139939. The next prime is 139943. The reversal of 139940 is 49931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 47524 + 92416 = 218^2 + 304^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139940.

It is not an unprimeable number, because it can be changed into a prime (139943) 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, 3479 + ... + 3518.

It is an arithmetic number, because the mean of its divisors is an integer number (24493).

2¹³⁹⁹⁴⁰ is an apocalyptic number.

139940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139940 is an abundant number, since it is smaller than the sum of its proper divisors (153976).

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

139940 is a wasteful number, since it uses less digits than its factorization.

139940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006 (or 7004 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 139940 is about 374.0855517124. The cubic root of 139940 is about 51.9175221098.

Subtracting from 139940 its reverse (49931), we obtain a palindrome (90009).

The spelling of 139940 in words is "one hundred thirty-nine thousand, nine hundred forty".