139668 has 24 divisors (see below), whose sum is σ = 331968. Its totient is φ = 45696.

The previous prime is 139663. The next prime is 139681. The reversal of 139668 is 866931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1180 + ... + 1292.

It is an arithmetic number, because the mean of its divisors is an integer number (13832).

2¹³⁹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

139668 is an abundant number, since it is smaller than the sum of its proper divisors (192300).

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

139668 is a wasteful number, since it uses less digits than its factorization.

139668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 221 counting only the distinct ones).

The product of its digits is 7776, while the sum is 33.

The square root of 139668 is about 373.7218216802. The cubic root of 139668 is about 51.8838631007.

The spelling of 139668 in words is "one hundred thirty-nine thousand, six hundred sixty-eight".