39728845 has 8 divisors (see below), whose sum is σ = 51341976. Its totient is φ = 29338176.

The previous prime is 39728839. The next prime is 39728891. The reversal of 39728845 is 54882793.

It can be written as a sum of positive squares in 4 ways, for example, as 6620329 + 33108516 = 2573^2 + 5754^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39728845 - 2¹⁷ = 39597773 is a prime.

It is a super-2 number, since 2×39728845² = 3156762250068050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39728795 and 39728804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305542 + ... + 305671.

It is an arithmetic number, because the mean of its divisors is an integer number (6417747).

Almost surely, 2^39728845 is an apocalyptic number.

It is an amenable number.

39728845 is a deficient number, since it is larger than the sum of its proper divisors (11613131).

39728845 is a wasteful number, since it uses less digits than its factorization.

39728845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611231.

The product of its digits is 483840, while the sum is 46.

The square root of 39728845 is about 6303.0821825516. The cubic root of 39728845 is about 341.2206556545.

The spelling of 39728845 in words is "thirty-nine million, seven hundred twenty-eight thousand, eight hundred forty-five".