40781823 has 4 divisors (see below), whose sum is σ = 54375768. Its totient is φ = 27187880.

The previous prime is 40781821. The next prime is 40781831. The reversal of 40781823 is 32818704.

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 40781823 - 2¹ = 40781821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40781821) 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, 6796968 + ... + 6796973.

It is an arithmetic number, because the mean of its divisors is an integer number (13593942).

Almost surely, 2^40781823 is an apocalyptic number.

40781823 is a deficient number, since it is larger than the sum of its proper divisors (13593945).

40781823 is a wasteful number, since it uses less digits than its factorization.

40781823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13593944.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 40781823 is about 6386.0647506896. The cubic root of 40781823 is about 344.2089922352.

The spelling of 40781823 in words is "forty million, seven hundred eighty-one thousand, eight hundred twenty-three".