40185668 has 6 divisors (see below), whose sum is σ = 70324926. Its totient is φ = 20092832.

The previous prime is 40185661. The next prime is 40185689. The reversal of 40185668 is 86658104.

It can be written as a sum of positive squares in only one way, i.e., 37356544 + 2829124 = 6112^2 + 1682^2 .

It is a super-2 number, since 2×40185668² = 3229775825212448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40185661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5023205 + ... + 5023212.

It is an arithmetic number, because the mean of its divisors is an integer number (11720821).

Almost surely, 2^40185668 is an apocalyptic number.

It is an amenable number.

40185668 is a deficient number, since it is larger than the sum of its proper divisors (30139258).

40185668 is a wasteful number, since it uses less digits than its factorization.

40185668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10046421 (or 10046419 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 40185668 is about 6339.2166708514. The cubic root of 40185668 is about 342.5235190840.

The spelling of 40185668 in words is "forty million, one hundred eighty-five thousand, six hundred sixty-eight".