39985957 has 4 divisors (see below), whose sum is σ = 43621056. Its totient is φ = 36350860.

The previous prime is 39985951. The next prime is 39985987. The reversal of 39985957 is 75958993.

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: 75958993 = 11 ⋅6905363.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39985957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 39985898 and 39985907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39985951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1817533 + ... + 1817554.

It is an arithmetic number, because the mean of its divisors is an integer number (10905264).

Almost surely, 2^39985957 is an apocalyptic number.

It is an amenable number.

39985957 is a deficient number, since it is larger than the sum of its proper divisors (3635099).

39985957 is a wasteful number, since it uses less digits than its factorization.

39985957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3635098.

The product of its digits is 3061800, while the sum is 55.

The square root of 39985957 is about 6323.4450262495. The cubic root of 39985957 is about 341.9551626638.

The spelling of 39985957 in words is "thirty-nine million, nine hundred eighty-five thousand, nine hundred fifty-seven".