139412 has 24 divisors (see below), whose sum is σ = 301056. Its totient is φ = 55008.

The previous prime is 139409. The next prime is 139423. The reversal of 139412 is 214931.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173 + ... + 555.

It is an arithmetic number, because the mean of its divisors is an integer number (12544).

2¹³⁹⁴¹² 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 139412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150528).

139412 is an abundant number, since it is smaller than the sum of its proper divisors (161644).

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

139412 is a wasteful number, since it uses less digits than its factorization.

139412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 405 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

The square root of 139412 is about 373.3791638536. The cubic root of 139412 is about 51.8521440901.

The spelling of 139412 in words is "one hundred thirty-nine thousand, four hundred twelve".