39720040 has 16 divisors (see below), whose sum is σ = 89370180. Its totient is φ = 15888000.

The previous prime is 39720019. The next prime is 39720059. The reversal of 39720040 is 4002793.

It can be written as a sum of positive squares in 2 ways, for example, as 38514436 + 1205604 = 6206^2 + 1098^2 .

It is a junction number, because it is equal to n+sod(n) for n = 39719987 and 39720014.

It is an unprimeable number.

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, 496461 + ... + 496540.

Almost surely, 2^39720040 is an apocalyptic number.

It is an amenable number.

39720040 is an abundant number, since it is smaller than the sum of its proper divisors (49650140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39720040 is a wasteful number, since it uses less digits than its factorization.

39720040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993012 (or 993008 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 39720040 is about 6302.3836760388. The cubic root of 39720040 is about 341.1954458449.

The spelling of 39720040 in words is "thirty-nine million, seven hundred twenty thousand, forty".