39986389 has 4 divisors (see below), whose sum is σ = 41365260. Its totient is φ = 38607520.

The previous prime is 39986383. The next prime is 39986413. The reversal of 39986389 is 98368993.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15563025 + 24423364 = 3945^2 + 4942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39986389 is a prime.

It is a super-2 number, since 2×39986389² = 3197822610518642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39986383) by changing a digit.

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, 689392 + ... + 689449.

It is an arithmetic number, because the mean of its divisors is an integer number (10341315).

Almost surely, 2^39986389 is an apocalyptic number.

It is an amenable number.

39986389 is a deficient number, since it is larger than the sum of its proper divisors (1378871).

39986389 is a wasteful number, since it uses less digits than its factorization.

39986389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1378870.

The product of its digits is 2519424, while the sum is 55.

The square root of 39986389 is about 6323.4791847526. The cubic root of 39986389 is about 341.9563941303.

The spelling of 39986389 in words is "thirty-nine million, nine hundred eighty-six thousand, three hundred eighty-nine".