40997781 has 24 divisors (see below), whose sum is σ = 64958400. Its totient is φ = 24710400.

The previous prime is 40997777. The next prime is 40997807. The reversal of 40997781 is 18779904.

40997781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40997781 - 2² = 40997777 is a prime.

It is a super-2 number, since 2×40997781² = 3361636093847922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40997381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18661 + ... + 20741.

It is an arithmetic number, because the mean of its divisors is an integer number (2706600).

Almost surely, 2^40997781 is an apocalyptic number.

It is an amenable number.

40997781 is a deficient number, since it is larger than the sum of its proper divisors (23960619).

40997781 is a wasteful number, since it uses less digits than its factorization.

40997781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2297 (or 2294 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 40997781 is about 6402.9509602995. The cubic root of 40997781 is about 344.8155031179.

The spelling of 40997781 in words is "forty million, nine hundred ninety-seven thousand, seven hundred eighty-one".