40781897 has 6 divisors (see below), whose sum is σ = 44160462. Its totient is φ = 37644672.

The previous prime is 40781893. The next prime is 40781911. The reversal of 40781897 is 79818704.

It can be written as a sum of positive squares in 3 ways, for example, as 383161 + 40398736 = 619^2 + 6356^2 .

It is not a de Polignac number, because 40781897 - 2² = 40781893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40781893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120488 + ... + 120825.

It is an arithmetic number, because the mean of its divisors is an integer number (7360077).

Almost surely, 2^40781897 is an apocalyptic number.

It is an amenable number.

40781897 is a deficient number, since it is larger than the sum of its proper divisors (3378565).

40781897 is a wasteful number, since it uses less digits than its factorization.

40781897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241339 (or 241326 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 40781897 is about 6386.0705445524. The cubic root of 40781897 is about 344.2092004280.

The spelling of 40781897 in words is "forty million, seven hundred eighty-one thousand, eight hundred ninety-seven".