39860987 has 4 divisors (see below), whose sum is σ = 39878760. Its totient is φ = 39843216.

The previous prime is 39860981. The next prime is 39861007. The reversal of 39860987 is 78906893.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78906893 = 13 ⋅6069761.

It is a cyclic number.

It is not a de Polignac number, because 39860987 - 2⁶ = 39860923 is a prime.

It is a super-2 number, since 2×39860987² = 3177796569228338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39860981) 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, 4937 + ... + 10202.

It is an arithmetic number, because the mean of its divisors is an integer number (9969690).

Almost surely, 2^39860987 is an apocalyptic number.

39860987 is a deficient number, since it is larger than the sum of its proper divisors (17773).

39860987 is a wasteful number, since it uses less digits than its factorization.

39860987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17772.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 39860987 is about 6313.5558126938. Note that the first 3 decimals coincide. The cubic root of 39860987 is about 341.5985480169.

The spelling of 39860987 in words is "thirty-nine million, eight hundred sixty thousand, nine hundred eighty-seven".