39640273 has 4 divisors (see below), whose sum is σ = 39687280. Its totient is φ = 39593268.

The previous prime is 39640261. The next prime is 39640291. The reversal of 39640273 is 37204693.

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: 37204693 = 61 ⋅609913.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39640273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39640253) 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, 22215 + ... + 23932.

It is an arithmetic number, because the mean of its divisors is an integer number (9921820).

Almost surely, 2^39640273 is an apocalyptic number.

It is an amenable number.

39640273 is a deficient number, since it is larger than the sum of its proper divisors (47007).

39640273 is an equidigital number, since it uses as much as digits as its factorization.

39640273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47006.

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 39640273 is about 6296.0521757686. The cubic root of 39640273 is about 340.9668930687.

The spelling of 39640273 in words is "thirty-nine million, six hundred forty thousand, two hundred seventy-three".