139720749 has 16 divisors (see below), whose sum is σ = 213073920. Its totient is φ = 79778160.

The previous prime is 139720747. The next prime is 139720781. The reversal of 139720749 is 947027931.

139720749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 139720749 - 2¹ = 139720747 is a prime.

It is a super-2 number, since 2×139720749² = 39043775402242002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 139720749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139720741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47092 + ... + 49970.

It is an arithmetic number, because the mean of its divisors is an integer number (13317120).

Almost surely, 2^139720749 is an apocalyptic number.

It is an amenable number.

139720749 is a deficient number, since it is larger than the sum of its proper divisors (73353171).

139720749 is a wasteful number, since it uses less digits than its factorization.

139720749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5200.

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 139720749 is about 11820.3531673127. The cubic root of 139720749 is about 518.9039401072.

The spelling of 139720749 in words is "one hundred thirty-nine million, seven hundred twenty thousand, seven hundred forty-nine".