406640111 has 8 divisors (see below), whose sum is σ = 409758624. Its totient is φ = 403532640.

The previous prime is 406640093. The next prime is 406640137. The reversal of 406640111 is 111046604.

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 406640111 - 2¹⁰ = 406639087 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 (406640011) 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, 80486 + ... + 85388.

It is an arithmetic number, because the mean of its divisors is an integer number (51219828).

Almost surely, 2^406640111 is an apocalyptic number.

406640111 is a deficient number, since it is larger than the sum of its proper divisors (3118513).

406640111 is a wasteful number, since it uses less digits than its factorization.

406640111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5521.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 406640111 is about 20165.3195114781. The cubic root of 406640111 is about 740.8610083985.

Adding to 406640111 its reverse (111046604), we get a palindrome (517686715).

The spelling of 406640111 in words is "four hundred six million, six hundred forty thousand, one hundred eleven".