40959781 has 4 divisors (see below), whose sum is σ = 41211232. Its totient is φ = 40708332.

The previous prime is 40959767. The next prime is 40959797. The reversal of 40959781 is 18795904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40959781 is a prime.

It is a super-2 number, since 2×40959781² = 3355407319135922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40939781) 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, 125481 + ... + 125806.

It is an arithmetic number, because the mean of its divisors is an integer number (10302808).

Almost surely, 2^40959781 is an apocalyptic number.

It is an amenable number.

40959781 is a deficient number, since it is larger than the sum of its proper divisors (251451).

40959781 is a wasteful number, since it uses less digits than its factorization.

40959781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251450.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 40959781 is about 6399.9828906021. The cubic root of 40959781 is about 344.7089360535.

The spelling of 40959781 in words is "forty million, nine hundred fifty-nine thousand, seven hundred eighty-one".