40409191 has 8 divisors (see below), whose sum is σ = 40962384. Its totient is φ = 39859200.

The previous prime is 40409179. The next prime is 40409197. The reversal of 40409191 is 19190404.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40409191 is a prime.

It is a super-3 number, since 3×40409191³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40409197) 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, 34471 + ... + 35623.

It is an arithmetic number, because the mean of its divisors is an integer number (5120298).

Almost surely, 2^40409191 is an apocalyptic number.

40409191 is a deficient number, since it is larger than the sum of its proper divisors (553193).

40409191 is a wasteful number, since it uses less digits than its factorization.

40409191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 40409191 is about 6356.8223980225. The cubic root of 40409191 is about 343.1574131488.

Adding to 40409191 its reverse (19190404), we get a palindrome (59599595).

It can be divided in two parts, 4040 and 9191, that added together give a palindrome (13231).

The spelling of 40409191 in words is "forty million, four hundred nine thousand, one hundred ninety-one".