40781423 has 2 divisors, whose sum is σ = 40781424. Its totient is φ = 40781422.

The previous prime is 40781413. The next prime is 40781431. The reversal of 40781423 is 32418704.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40781423 - 2¹⁶ = 40715887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40781413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20390711 + 20390712.

It is an arithmetic number, because the mean of its divisors is an integer number (20390712).

Almost surely, 2^40781423 is an apocalyptic number.

40781423 is a deficient number, since it is larger than the sum of its proper divisors (1).

40781423 is an equidigital number, since it uses as much as digits as its factorization.

40781423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 40781423 is about 6386.0334324211. The cubic root of 40781423 is about 344.2078668642.

The spelling of 40781423 in words is "forty million, seven hundred eighty-one thousand, four hundred twenty-three".