139721346 has 12 divisors (see below), whose sum is σ = 302729622. Its totient is φ = 46573776.

The previous prime is 139721311. The next prime is 139721347. The reversal of 139721346 is 643127931.

It can be written as a sum of positive squares in only one way, i.e., 100220121 + 39501225 = 10011^2 + 6285^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 139721346.

It is not an unprimeable number, because it can be changed into a prime (139721347) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 3881131 + ... + 3881166.

Almost surely, 2^139721346 is an apocalyptic number.

139721346 is an abundant number, since it is smaller than the sum of its proper divisors (163008276).

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

139721346 is a wasteful number, since it uses less digits than its factorization.

139721346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7762305 (or 7762302 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 139721346 is about 11820.3784203383. The cubic root of 139721346 is about 518.9046791652.

The spelling of 139721346 in words is "one hundred thirty-nine million, seven hundred twenty-one thousand, three hundred forty-six".