31386985 has 8 divisors (see below), whose sum is σ = 43045056. Its totient is φ = 21522480.

The previous prime is 31386983. The next prime is 31386991. The reversal of 31386985 is 58968313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31386985 - 2¹ = 31386983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31386983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448351 + ... + 448420.

It is an arithmetic number, because the mean of its divisors is an integer number (5380632).

Almost surely, 2^31386985 is an apocalyptic number.

31386985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31386985 is a deficient number, since it is larger than the sum of its proper divisors (11658071).

31386985 is an equidigital number, since it uses as much as digits as its factorization.

31386985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 896783.

The product of its digits is 155520, while the sum is 43.

The square root of 31386985 is about 5602.4088569115. The cubic root of 31386985 is about 315.4398323752.

The spelling of 31386985 in words is "thirty-one million, three hundred eighty-six thousand, nine hundred eighty-five".