40188660 has 96 divisors (see below), whose sum is σ = 118538112. Its totient is φ = 10160640.

The previous prime is 40188641. The next prime is 40188661. The reversal of 40188660 is 6688104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40188661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95250 + ... + 95670.

It is an arithmetic number, because the mean of its divisors is an integer number (1234772).

Almost surely, 2^40188660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40188660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59269056).

40188660 is an abundant number, since it is smaller than the sum of its proper divisors (78349452).

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

40188660 is a wasteful number, since it uses less digits than its factorization.

40188660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 40188660 is about 6339.4526577616. The cubic root of 40188660 is about 342.5320196679.

The spelling of 40188660 in words is "forty million, one hundred eighty-eight thousand, six hundred sixty".