139385505 has 16 divisors (see below), whose sum is σ = 254876544. Its totient is φ = 63719040.

The previous prime is 139385461. The next prime is 139385507. The reversal of 139385505 is 505583931.

It is a happy number.

It is not a de Polignac number, because 139385505 - 2⁷ = 139385377 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139385507) 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 15 ways as a sum of consecutive naturals, for example, 663636 + ... + 663845.

It is an arithmetic number, because the mean of its divisors is an integer number (15929784).

Almost surely, 2^139385505 is an apocalyptic number.

139385505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139385505 is a deficient number, since it is larger than the sum of its proper divisors (115491039).

139385505 is a wasteful number, since it uses less digits than its factorization.

139385505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327496.

The product of its (nonzero) digits is 81000, while the sum is 39.

The square root of 139385505 is about 11806.1638562236. The cubic root of 139385505 is about 518.4885907969.

The spelling of 139385505 in words is "one hundred thirty-nine million, three hundred eighty-five thousand, five hundred five".