139688820 has 96 divisors (see below), whose sum is σ = 437472000. Its totient is φ = 37003392.

The previous prime is 139688819. The next prime is 139688849. The reversal of 139688820 is 28886931.

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 31 ways as a sum of consecutive naturals, for example, 89406 + ... + 90954.

It is an arithmetic number, because the mean of its divisors is an integer number (4557000).

Almost surely, 2^139688820 is an apocalyptic number.

139688820 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 139688820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218736000).

139688820 is an abundant number, since it is smaller than the sum of its proper divisors (297783180).

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

139688820 is a wasteful number, since it uses less digits than its factorization.

139688820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1734 (or 1726 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The square root of 139688820 is about 11819.0024959808. The cubic root of 139688820 is about 518.8644104353.

The spelling of 139688820 in words is "one hundred thirty-nine million, six hundred eighty-eight thousand, eight hundred twenty".