40678891 has 4 divisors (see below), whose sum is σ = 44376984. Its totient is φ = 36980800.

The previous prime is 40678889. The next prime is 40678919. The reversal of 40678891 is 19887604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40678891 - 2¹ = 40678889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40678871) 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, 1849030 + ... + 1849051.

It is an arithmetic number, because the mean of its divisors is an integer number (11094246).

Almost surely, 2^40678891 is an apocalyptic number.

40678891 is a deficient number, since it is larger than the sum of its proper divisors (3698093).

40678891 is a wasteful number, since it uses less digits than its factorization.

40678891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3698092.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 40678891 is about 6378.0005487613. Note that the first 3 decimals coincide. The cubic root of 40678891 is about 343.9191574722.

It can be divided in two parts, 406 and 78891, that added together give a palindrome (79297).

The spelling of 40678891 in words is "forty million, six hundred seventy-eight thousand, eight hundred ninety-one".