139497985 has 16 divisors (see below), whose sum is σ = 188508672. Its totient is φ = 98179200.

The previous prime is 139497973. The next prime is 139497989. The reversal of 139497985 is 589794931.

It is not a de Polignac number, because 139497985 - 2⁷ = 139497857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (139497989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39204 + ... + 42613.

It is an arithmetic number, because the mean of its divisors is an integer number (11781792).

Almost surely, 2^139497985 is an apocalyptic number.

It is an amenable number.

139497985 is a deficient number, since it is larger than the sum of its proper divisors (49010687).

139497985 is a wasteful number, since it uses less digits than its factorization.

139497985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81864.

The product of its digits is 2449440, while the sum is 55.

The square root of 139497985 is about 11810.9265089577. The cubic root of 139497985 is about 518.6280216421.

The spelling of 139497985 in words is "one hundred thirty-nine million, four hundred ninety-seven thousand, nine hundred eighty-five".