139661712 has 80 divisors (see below), whose sum is σ = 403724160. Its totient is φ = 46224000.

The previous prime is 139661699. The next prime is 139661713. The reversal of 139661712 is 217166931.

139661712 is a `hidden beast` number, since 1 + 39 + 6 + 617 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (139661713) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64162 + ... + 66302.

It is an arithmetic number, because the mean of its divisors is an integer number (5046552).

Almost surely, 2^139661712 is an apocalyptic number.

139661712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139661712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201862080).

139661712 is an abundant number, since it is smaller than the sum of its proper divisors (264062448).

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

139661712 is a wasteful number, since it uses less digits than its factorization.

139661712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309 (or 2297 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 139661712 is about 11817.8556430513. The cubic root of 139661712 is about 518.8308446701.

The spelling of 139661712 in words is "one hundred thirty-nine million, six hundred sixty-one thousand, seven hundred twelve".