40781039 has 4 divisors (see below), whose sum is σ = 43918056. Its totient is φ = 37644024.

The previous prime is 40781021. The next prime is 40781053. The reversal of 40781039 is 93018704.

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 40781039 - 2²⁴ = 24003823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40780996 and 40781014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40781339) 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, 1568489 + ... + 1568514.

It is an arithmetic number, because the mean of its divisors is an integer number (10979514).

Almost surely, 2^40781039 is an apocalyptic number.

40781039 is a deficient number, since it is larger than the sum of its proper divisors (3137017).

40781039 is a wasteful number, since it uses less digits than its factorization.

40781039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3137016.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 40781039 is about 6386.0033667389. The cubic root of 40781039 is about 344.2067865010.

The spelling of 40781039 in words is "forty million, seven hundred eighty-one thousand, thirty-nine".