139419820 has 24 divisors (see below), whose sum is σ = 302878800. Its totient is φ = 53844672.

The previous prime is 139419817. The next prime is 139419827. The reversal of 139419820 is 28914931.

It is a self number, because there is not a number n which added to its sum of digits gives 139419820.

It is not an unprimeable number, because it can be changed into a prime (139419827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119610 + ... + 120769.

It is an arithmetic number, because the mean of its divisors is an integer number (12619950).

Almost surely, 2^139419820 is an apocalyptic number.

139419820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139419820 is an abundant number, since it is smaller than the sum of its proper divisors (163458980).

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

139419820 is a wasteful number, since it uses less digits than its factorization.

139419820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240417 (or 240415 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 139419820 is about 11807.6170330850. The cubic root of 139419820 is about 518.5311358142.

The spelling of 139419820 in words is "one hundred thirty-nine million, four hundred nineteen thousand, eight hundred twenty".