40282643 has 4 divisors (see below), whose sum is σ = 40473768. Its totient is φ = 40091520.

The previous prime is 40282607. The next prime is 40282651. The reversal of 40282643 is 34628204.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40282643 - 2¹² = 40278547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40282043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95246 + ... + 95667.

It is an arithmetic number, because the mean of its divisors is an integer number (10118442).

Almost surely, 2^40282643 is an apocalyptic number.

40282643 is a deficient number, since it is larger than the sum of its proper divisors (191125).

40282643 is a wasteful number, since it uses less digits than its factorization.

40282643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191124.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 40282643 is about 6346.8608776308. The cubic root of 40282643 is about 342.7988206765.

The spelling of 40282643 in words is "forty million, two hundred eighty-two thousand, six hundred forty-three".