139891680 has 144 divisors (see below), whose sum is σ = 502603920. Its totient is φ = 35334144.

The previous prime is 139891673. The next prime is 139891729. The reversal of 139891680 is 86198931.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24804 + ... + 29916.

It is an arithmetic number, because the mean of its divisors is an integer number (3490305).

Almost surely, 2^139891680 is an apocalyptic number.

139891680 is a gapful number since it is divisible by the number (10) 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 139891680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251301960).

139891680 is an abundant number, since it is smaller than the sum of its proper divisors (362712240).

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

139891680 is a wasteful number, since it uses less digits than its factorization.

139891680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5153 (or 5142 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 139891680 is about 11827.5813250216. The cubic root of 139891680 is about 519.1154587369.

The spelling of 139891680 in words is "one hundred thirty-nine million, eight hundred ninety-one thousand, six hundred eighty".