40643235 has 32 divisors (see below), whose sum is σ = 72737280. Its totient is φ = 21531744.

The previous prime is 40643233. The next prime is 40643257. The reversal of 40643235 is 53234604.

It is not a de Polignac number, because 40643235 - 2¹ = 40643233 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 40643199 and 40643208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40643233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21082 + ... + 22928.

It is an arithmetic number, because the mean of its divisors is an integer number (2273040).

Almost surely, 2^40643235 is an apocalyptic number.

40643235 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

40643235 is a deficient number, since it is larger than the sum of its proper divisors (32094045).

40643235 is a wasteful number, since it uses less digits than its factorization.

40643235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024 (or 2018 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

The square root of 40643235 is about 6375.2047025958. The cubic root of 40643235 is about 343.8186437020.

Adding to 40643235 its reverse (53234604), we get a palindrome (93877839).

The spelling of 40643235 in words is "forty million, six hundred forty-three thousand, two hundred thirty-five".