139640220 has 192 divisors, whose sum is σ = 463478400. Its totient is φ = 34836480.

The previous prime is 139640161. The next prime is 139640239. The reversal of 139640220 is 22046931.

139640220 is a `hidden beast` number, since 13 + 9 + 640 + 2 + 2 + 0 = 666.

139640220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 579300 + ... + 579540.

It is an arithmetic number, because the mean of its divisors is an integer number (2413950).

Almost surely, 2^139640220 is an apocalyptic number.

139640220 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 139640220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231739200).

139640220 is an abundant number, since it is smaller than the sum of its proper divisors (323838180).

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

139640220 is a wasteful number, since it uses less digits than its factorization.

139640220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 139640220 is about 11816.9463060471. The cubic root of 139640220 is about 518.8042296817.

It can be divided in two parts, 1396 and 40220, that added together give a triangular number (41616 = T₂₈₈).

The spelling of 139640220 in words is "one hundred thirty-nine million, six hundred forty thousand, two hundred twenty".