40643311 has 16 divisors (see below), whose sum is σ = 44126208. Its totient is φ = 37296000.

The previous prime is 40643269. The next prime is 40643321. The reversal of 40643311 is 11334604.

It is a cyclic number.

It is not a de Polignac number, because 40643311 - 2¹⁷ = 40512239 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 (40643321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182146 + ... + 182368.

It is an arithmetic number, because the mean of its divisors is an integer number (2757888).

Almost surely, 2^40643311 is an apocalyptic number.

40643311 is a deficient number, since it is larger than the sum of its proper divisors (3482897).

40643311 is a wasteful number, since it uses less digits than its factorization.

40643311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 40643311 is about 6375.2106631860. The cubic root of 40643311 is about 343.8188580075.

Adding to 40643311 its reverse (11334604), we get a palindrome (51977915).

The spelling of 40643311 in words is "forty million, six hundred forty-three thousand, three hundred eleven".