139345769 has 4 divisors (see below), whose sum is σ = 140075520. Its totient is φ = 138616020.

The previous prime is 139345763. The next prime is 139345823. The reversal of 139345769 is 967543931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 967543931 = 8627 ⋅112153.

It is a cyclic number.

It is not a de Polignac number, because 139345769 - 2²⁴ = 122568553 is a prime.

It is a super-2 number, since 2×139345769² = 38834486676402722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139345763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364589 + ... + 364970.

It is an arithmetic number, because the mean of its divisors is an integer number (35018880).

Almost surely, 2^139345769 is an apocalyptic number.

It is an amenable number.

139345769 is a deficient number, since it is larger than the sum of its proper divisors (729751).

139345769 is an equidigital number, since it uses as much as digits as its factorization.

139345769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729750.

The product of its digits is 612360, while the sum is 47.

The square root of 139345769 is about 11804.4808865109. The cubic root of 139345769 is about 518.4393158962.

The spelling of 139345769 in words is "one hundred thirty-nine million, three hundred forty-five thousand, seven hundred sixty-nine".