40333781 has 2 divisors, whose sum is σ = 40333782. Its totient is φ = 40333780.

The previous prime is 40333763. The next prime is 40333793. The reversal of 40333781 is 18733304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35343025 + 4990756 = 5945^2 + 2234^2 .

It is a cyclic number.

It is not a de Polignac number, because 40333781 - 2¹⁴ = 40317397 is a prime.

It is a super-2 number, since 2×40333781² = 3253627779511922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40333981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20166890 + 20166891.

It is an arithmetic number, because the mean of its divisors is an integer number (20166891).

Almost surely, 2^40333781 is an apocalyptic number.

It is an amenable number.

40333781 is a deficient number, since it is larger than the sum of its proper divisors (1).

40333781 is an equidigital number, since it uses as much as digits as its factorization.

40333781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 40333781 is about 6350.8882055977. Note that the first 3 decimals coincide. The cubic root of 40333781 is about 342.9438180583.

It can be divided in two parts, 40333 and 781, that added together give a palindrome (41114).

The spelling of 40333781 in words is "forty million, three hundred thirty-three thousand, seven hundred eighty-one".