139724220 has 48 divisors (see below), whose sum is σ = 393247008. Its totient is φ = 37067520.

The previous prime is 139724201. The next prime is 139724227. The reversal of 139724220 is 22427931.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139724227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5910 + ... + 17730.

It is an arithmetic number, because the mean of its divisors is an integer number (8192646).

Almost surely, 2^139724220 is an apocalyptic number.

139724220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 11820×11821.

It is an amenable number.

139724220 is an abundant number, since it is smaller than the sum of its proper divisors (253522788).

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

139724220 is a wasteful number, since it uses less digits than its factorization.

139724220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12030 (or 12028 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 139724220 is about 11820.4999894252. The cubic root of 139724220 is about 518.9082370130.

The spelling of 139724220 in words is "one hundred thirty-nine million, seven hundred twenty-four thousand, two hundred twenty".