139087305 has 24 divisors (see below), whose sum is σ = 275525952. Its totient is φ = 63582624.

The previous prime is 139087303. The next prime is 139087309. The reversal of 139087305 is 503780931.

It is not a de Polignac number, because 139087305 - 2¹ = 139087303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139087305.

It is not an unprimeable number, because it can be changed into a prime (139087303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220459 + ... + 221088.

It is an arithmetic number, because the mean of its divisors is an integer number (11480248).

Almost surely, 2^139087305 is an apocalyptic number.

139087305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139087305 is a deficient number, since it is larger than the sum of its proper divisors (136438647).

139087305 is a wasteful number, since it uses less digits than its factorization.

139087305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441565 (or 441562 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 139087305 is about 11793.5280980714. The cubic root of 139087305 is about 518.1185769795.

The spelling of 139087305 in words is "one hundred thirty-nine million, eighty-seven thousand, three hundred five".