139381820 has 24 divisors (see below), whose sum is σ = 296714544. Its totient is φ = 54988416.

The previous prime is 139381819. The next prime is 139381831. The reversal of 139381820 is 28183931.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46274 + ... + 49193.

It is an arithmetic number, because the mean of its divisors is an integer number (12363106).

Almost surely, 2^139381820 is an apocalyptic number.

139381820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139381820 is an abundant number, since it is smaller than the sum of its proper divisors (157332724).

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

139381820 is a wasteful number, since it uses less digits than its factorization.

139381820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95549 (or 95547 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 139381820 is about 11806.0077926452. The cubic root of 139381820 is about 518.4840215813.

The spelling of 139381820 in words is "one hundred thirty-nine million, three hundred eighty-one thousand, eight hundred twenty".