40066191 has 32 divisors (see below), whose sum is σ = 65111040. Its totient is φ = 24148800.

The previous prime is 40066177. The next prime is 40066217. The reversal of 40066191 is 19166004.

40066191 = 1339² + 1340² + ... + 1360².

40066191 is a `hidden beast` number, since 40 + 0 + 6 + 619 + 1 = 666.

It is not a de Polignac number, because 40066191 - 2⁹ = 40065679 is a prime.

It is a super-2 number, since 2×40066191² = 3210599322496962, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40066151) 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, 92746 + ... + 93176.

It is an arithmetic number, because the mean of its divisors is an integer number (2034720).

Almost surely, 2^40066191 is an apocalyptic number.

40066191 is a deficient number, since it is larger than the sum of its proper divisors (25044849).

40066191 is a wasteful number, since it uses less digits than its factorization.

40066191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 758 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 40066191 is about 6329.7860153405. The cubic root of 40066191 is about 342.1837270742.

The spelling of 40066191 in words is "forty million, sixty-six thousand, one hundred ninety-one".