40518091 has 8 divisors (see below), whose sum is σ = 41341104. Its totient is φ = 39700320.

The previous prime is 40518061. The next prime is 40518097. The reversal of 40518091 is 19081504.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40518091 - 2⁵ = 40518059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40518097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16740 + ... + 19006.

It is an arithmetic number, because the mean of its divisors is an integer number (5167638).

Almost surely, 2^40518091 is an apocalyptic number.

40518091 is a deficient number, since it is larger than the sum of its proper divisors (823013).

40518091 is a wasteful number, since it uses less digits than its factorization.

40518091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2621.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 40518091 is about 6365.3822351843. The cubic root of 40518091 is about 343.4653985502.

Adding to 40518091 its reverse (19081504), we get a palindrome (59599595).

It can be divided in two parts, 405 and 18091, that added together give a square (18496 = 136²).

The spelling of 40518091 in words is "forty million, five hundred eighteen thousand, ninety-one".