40478831 has 2 divisors, whose sum is σ = 40478832. Its totient is φ = 40478830.

The previous prime is 40478813. The next prime is 40478899. The reversal of 40478831 is 13887404.

It is a happy number.

Together with previous prime (40478813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40478831 is a prime.

It is a super-2 number, since 2×40478831² = 3277071518253122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40478791 and 40478800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40471831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20239415 + 20239416.

It is an arithmetic number, because the mean of its divisors is an integer number (20239416).

Almost surely, 2^40478831 is an apocalyptic number.

40478831 is a deficient number, since it is larger than the sum of its proper divisors (1).

40478831 is an equidigital number, since it uses as much as digits as its factorization.

40478831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 40478831 is about 6362.2976195711. The cubic root of 40478831 is about 343.3544291140.

The spelling of 40478831 in words is "forty million, four hundred seventy-eight thousand, eight hundred thirty-one".