139623073 has 4 divisors (see below), whose sum is σ = 139673520. Its totient is φ = 139572628.

The previous prime is 139623067. The next prime is 139623079. The reversal of 139623073 is 370326931.

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: 370326931 = 13 ⋅28486687.

It is an interprime number because it is at equal distance from previous prime (139623067) and next prime (139623079).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139623073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139623079) 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, 20815 + ... + 26692.

It is an arithmetic number, because the mean of its divisors is an integer number (34918380).

Almost surely, 2^139623073 is an apocalyptic number.

It is an amenable number.

139623073 is a deficient number, since it is larger than the sum of its proper divisors (50447).

139623073 is an equidigital number, since it uses as much as digits as its factorization.

139623073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50446.

The product of its (nonzero) digits is 20412, while the sum is 34.

The square root of 139623073 is about 11816.2207579243. The cubic root of 139623073 is about 518.7829934403.

The spelling of 139623073 in words is "one hundred thirty-nine million, six hundred twenty-three thousand, seventy-three".