31386666 has 8 divisors (see below), whose sum is σ = 62773344. Its totient is φ = 10462220.

The previous prime is 31386661. The next prime is 31386673. The reversal of 31386666 is 66668313.

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

31386666 is an admirable number.

31386666 is a modest number, since divided by 6666 gives 3138 as remainder.

It is not an unprimeable number, because it can be changed into a prime (31386661) 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, 2615550 + ... + 2615561.

It is an arithmetic number, because the mean of its divisors is an integer number (7846668).

Almost surely, 2^31386666 is an apocalyptic number.

31386666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31386666 is a wasteful number, since it uses less digits than its factorization.

31386666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5231116.

The product of its digits is 93312, while the sum is 39.

The square root of 31386666 is about 5602.3803869427. The cubic root of 31386666 is about 315.4387637194.

The spelling of 31386666 in words is "thirty-one million, three hundred eighty-six thousand, six hundred sixty-six".