40181660 has 12 divisors (see below), whose sum is σ = 84381528. Its totient is φ = 16072656.

The previous prime is 40181653. The next prime is 40181677. The reversal of 40181660 is 6618104.

It is a super-2 number, since 2×40181660² = 3229131600711200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1004522 + ... + 1004561.

It is an arithmetic number, because the mean of its divisors is an integer number (7031794).

Almost surely, 2^40181660 is an apocalyptic number.

It is an amenable number.

40181660 is an abundant number, since it is smaller than the sum of its proper divisors (44199868).

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

40181660 is a wasteful number, since it uses less digits than its factorization.

40181660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2009092 (or 2009090 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 40181660 is about 6338.9005355819. The cubic root of 40181660 is about 342.5121312768.

Adding to 40181660 its reverse (6618104), we get a palindrome (46799764).

The spelling of 40181660 in words is "forty million, one hundred eighty-one thousand, six hundred sixty".