139097747 has 4 divisors (see below), whose sum is σ = 139377000. Its totient is φ = 138818496.

The previous prime is 139097737. The next prime is 139097759. The reversal of 139097747 is 747790931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 139097747 - 2⁶ = 139097683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139097737) 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 3 ways as a sum of consecutive naturals, for example, 138878 + ... + 139875.

It is an arithmetic number, because the mean of its divisors is an integer number (34844250).

Almost surely, 2^139097747 is an apocalyptic number.

139097747 is a deficient number, since it is larger than the sum of its proper divisors (279253).

139097747 is an equidigital number, since it uses as much as digits as its factorization.

139097747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279252.

The product of its (nonzero) digits is 333396, while the sum is 47.

The square root of 139097747 is about 11793.9707901962. The cubic root of 139097747 is about 518.1315425979.

The spelling of 139097747 in words is "one hundred thirty-nine million, ninety-seven thousand, seven hundred forty-seven".