39728523 has 8 divisors (see below), whose sum is σ = 53203600. Its totient is φ = 26369568.

The previous prime is 39728509. The next prime is 39728561. The reversal of 39728523 is 32582793.

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

It is not a de Polignac number, because 39728523 - 2⁶ = 39728459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39728503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28228 + ... + 29601.

It is an arithmetic number, because the mean of its divisors is an integer number (6650450).

Almost surely, 2^39728523 is an apocalyptic number.

39728523 is a deficient number, since it is larger than the sum of its proper divisors (13475077).

39728523 is a wasteful number, since it uses less digits than its factorization.

39728523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58061.

The product of its digits is 90720, while the sum is 39.

The square root of 39728523 is about 6303.0566394409. The cubic root of 39728523 is about 341.2197337941.

It can be divided in two parts, 397 and 28523, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 39728523 in words is "thirty-nine million, seven hundred twenty-eight thousand, five hundred twenty-three".