39985961 has 4 divisors (see below), whose sum is σ = 40006032. Its totient is φ = 39965892.

The previous prime is 39985951. The next prime is 39985987. The reversal of 39985961 is 16958993.

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: 16958993 = 53 ⋅319981.

It is a cyclic number.

It is not a de Polignac number, because 39985961 - 2¹⁴ = 39969577 is a prime.

It is a Duffinian number.

It is a Curzon 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, 6671 + ... + 11156.

It is an arithmetic number, because the mean of its divisors is an integer number (10001508).

Almost surely, 2^39985961 is an apocalyptic number.

It is an amenable number.

39985961 is a deficient number, since it is larger than the sum of its proper divisors (20071).

39985961 is a wasteful number, since it uses less digits than its factorization.

39985961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20070.

The product of its digits is 524880, while the sum is 50.

The square root of 39985961 is about 6323.4453425328. The cubic root of 39985961 is about 341.9551740663.

The spelling of 39985961 in words is "thirty-nine million, nine hundred eighty-five thousand, nine hundred sixty-one".