40041997 has 2 divisors, whose sum is σ = 40041998. Its totient is φ = 40041996.

The previous prime is 40041983. The next prime is 40042007. The reversal of 40041997 is 79914004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33339076 + 6702921 = 5774^2 + 2589^2 .

It is a cyclic number.

It is not a de Polignac number, because 40041997 - 2¹¹ = 40039949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40041907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20020998 + 20020999.

It is an arithmetic number, because the mean of its divisors is an integer number (20020999).

Almost surely, 2^40041997 is an apocalyptic number.

It is an amenable number.

40041997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40041997 is an equidigital number, since it uses as much as digits as its factorization.

40041997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 40041997 is about 6327.8746036880. The cubic root of 40041997 is about 342.1148372377.

The spelling of 40041997 in words is "forty million, forty-one thousand, nine hundred ninety-seven".