39581997 has 48 divisors (see below), whose sum is σ = 68866560. Its totient is φ = 19745856.

The previous prime is 39581981. The next prime is 39582007. The reversal of 39581997 is 79918593.

It is a happy number.

It is not a de Polignac number, because 39581997 - 2⁴ = 39581981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39581957) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67138 + ... + 67724.

It is an arithmetic number, because the mean of its divisors is an integer number (1434720).

Almost surely, 2^39581997 is an apocalyptic number.

It is an amenable number.

39581997 is a deficient number, since it is larger than the sum of its proper divisors (29284563).

39581997 is a wasteful number, since it uses less digits than its factorization.

39581997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 629 counting only the distinct ones).

The product of its digits is 612360, while the sum is 51.

The square root of 39581997 is about 6291.4224941582. The cubic root of 39581997 is about 340.7997235858.

The spelling of 39581997 in words is "thirty-nine million, five hundred eighty-one thousand, nine hundred ninety-seven".