31389066 has 64 divisors (see below), whose sum is σ = 73728000. Its totient is φ = 9879408.

The previous prime is 31389053. The next prime is 31389079. The reversal of 31389066 is 66098313.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31389053) and next prime (31389079).

It is a self number, because there is not a number n which added to its sum of digits gives 31389066.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157635 + ... + 157833.

It is an arithmetic number, because the mean of its divisors is an integer number (1152000).

Almost surely, 2^31389066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31389066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36864000).

31389066 is an abundant number, since it is smaller than the sum of its proper divisors (42338934).

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

31389066 is a wasteful number, since it uses less digits than its factorization.

31389066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 31389066 is about 5602.5945775150. The cubic root of 31389066 is about 315.4468035851.

The spelling of 31389066 in words is "thirty-one million, three hundred eighty-nine thousand, sixty-six".