139869912 has 128 divisors (see below), whose sum is σ = 439488000. Its totient is φ = 36860544.

The previous prime is 139869911. The next prime is 139869991. The reversal of 139869912 is 219968931.

139869912 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139869911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106363 + ... + 107669.

It is an arithmetic number, because the mean of its divisors is an integer number (3433500).

Almost surely, 2^139869912 is an apocalyptic number.

139869912 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 139869912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219744000).

139869912 is an abundant number, since it is smaller than the sum of its proper divisors (299618088).

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

139869912 is a wasteful number, since it uses less digits than its factorization.

139869912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350 (or 1332 counting only the distinct ones).

The product of its digits is 209952, while the sum is 48.

The square root of 139869912 is about 11826.6610672666. The cubic root of 139869912 is about 519.0885314947.

The spelling of 139869912 in words is "one hundred thirty-nine million, eight hundred sixty-nine thousand, nine hundred twelve".