40866813 has 24 divisors (see below), whose sum is σ = 65056992. Its totient is φ = 24560928.

The previous prime is 40866811. The next prime is 40866817. The reversal of 40866813 is 31866804.

It is a happy number.

It is not a de Polignac number, because 40866813 - 2¹ = 40866811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40866811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 970 + ... + 9092.

It is an arithmetic number, because the mean of its divisors is an integer number (2710708).

Almost surely, 2^40866813 is an apocalyptic number.

40866813 is a gapful number since it is divisible by the number (43) formed by its first and last digit.

It is an amenable number.

40866813 is a deficient number, since it is larger than the sum of its proper divisors (24190179).

40866813 is a wasteful number, since it uses less digits than its factorization.

40866813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8185 (or 8182 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 40866813 is about 6392.7156201414. The cubic root of 40866813 is about 344.4479387513.

Subtracting from 40866813 its reverse (31866804), we obtain a palindrome (9000009).

The spelling of 40866813 in words is "forty million, eight hundred sixty-six thousand, eight hundred thirteen".