40685813 has 4 divisors (see below), whose sum is σ = 46498080. Its totient is φ = 34873548.

The previous prime is 40685809. The next prime is 40685831. The reversal of 40685813 is 31858604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40685813 - 2² = 40685809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40685863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2906123 + ... + 2906136.

It is an arithmetic number, because the mean of its divisors is an integer number (11624520).

Almost surely, 2^40685813 is an apocalyptic number.

It is an amenable number.

40685813 is a deficient number, since it is larger than the sum of its proper divisors (5812267).

40685813 is an equidigital number, since it uses as much as digits as its factorization.

40685813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5812266.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 40685813 is about 6378.5431722298. The cubic root of 40685813 is about 343.9386636856.

The spelling of 40685813 in words is "forty million, six hundred eighty-five thousand, eight hundred thirteen".