40753781 has 4 divisors (see below), whose sum is σ = 40802412. Its totient is φ = 40705152.

The previous prime is 40753763. The next prime is 40753813. The reversal of 40753781 is 18735704.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13359025 + 27394756 = 3655^2 + 5234^2 .

It is a cyclic number.

It is not a de Polignac number, because 40753781 - 2⁶ = 40753717 is a prime.

It is a super-2 number, since 2×40753781² = 3321741331591922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40753721) 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, 23036 + ... + 24741.

It is an arithmetic number, because the mean of its divisors is an integer number (10200603).

Almost surely, 2^40753781 is an apocalyptic number.

It is an amenable number.

40753781 is a deficient number, since it is larger than the sum of its proper divisors (48631).

40753781 is an equidigital number, since it uses as much as digits as its factorization.

40753781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48630.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 40753781 is about 6383.8688113087. The cubic root of 40753781 is about 344.1300802671.

The spelling of 40753781 in words is "forty million, seven hundred fifty-three thousand, seven hundred eighty-one".