40402997 has 2 divisors, whose sum is σ = 40402998. Its totient is φ = 40402996.

The previous prime is 40402969. The next prime is 40403009. The reversal of 40402997 is 79920404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37871716 + 2531281 = 6154^2 + 1591^2 .

It is a cyclic number.

It is not a de Polignac number, because 40402997 - 2⁶ = 40402933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40408997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20201498 + 20201499.

It is an arithmetic number, because the mean of its divisors is an integer number (20201499).

Almost surely, 2^40402997 is an apocalyptic number.

It is an amenable number.

40402997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40402997 is an equidigital number, since it uses as much as digits as its factorization.

40402997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 40402997 is about 6356.3351862532. The cubic root of 40402997 is about 343.1398789725.

The spelling of 40402997 in words is "forty million, four hundred two thousand, nine hundred ninety-seven".