139780724 has 6 divisors (see below), whose sum is σ = 244616274. Its totient is φ = 69890360.

The previous prime is 139780721. The next prime is 139780747. The reversal of 139780724 is 427087931.

It can be written as a sum of positive squares in only one way, i.e., 139665124 + 115600 = 11818^2 + 340^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139780721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17472587 + ... + 17472594.

It is an arithmetic number, because the mean of its divisors is an integer number (40769379).

Almost surely, 2^139780724 is an apocalyptic number.

It is an amenable number.

139780724 is a deficient number, since it is larger than the sum of its proper divisors (104835550).

139780724 is a wasteful number, since it uses less digits than its factorization.

139780724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34945185 (or 34945183 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 139780724 is about 11822.8898328624. The cubic root of 139780724 is about 518.9781758290.

The spelling of 139780724 in words is "one hundred thirty-nine million, seven hundred eighty thousand, seven hundred twenty-four".