39720481 has 4 divisors (see below), whose sum is σ = 40313392. Its totient is φ = 39127572.

The previous prime is 39720467. The next prime is 39720487. The reversal of 39720481 is 18402793.

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: 18402793 = 3923 ⋅4691.

It is a cyclic number.

It is not a de Polignac number, because 39720481 - 2⁷ = 39720353 is a prime.

It is a super-2 number, since 2×39720481² = 3155433221742722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39720487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296355 + ... + 296488.

It is an arithmetic number, because the mean of its divisors is an integer number (10078348).

Almost surely, 2^39720481 is an apocalyptic number.

It is an amenable number.

39720481 is a deficient number, since it is larger than the sum of its proper divisors (592911).

39720481 is an equidigital number, since it uses as much as digits as its factorization.

39720481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592910.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 39720481 is about 6302.4186627040. The cubic root of 39720481 is about 341.1967085714.

It can be divided in two parts, 3972048 and 1, that added together give a square (3972049 = 1993²).

The spelling of 39720481 in words is "thirty-nine million, seven hundred twenty thousand, four hundred eighty-one".