40689497 has 2 divisors, whose sum is σ = 40689498. Its totient is φ = 40689496.

The previous prime is 40689491. The next prime is 40689557. The reversal of 40689497 is 79498604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40589641 + 99856 = 6371^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 40689497 - 2⁶ = 40689433 is a prime.

It is a super-2 number, since 2×40689497² = 3311270332226018, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40689491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20344748 + 20344749.

It is an arithmetic number, because the mean of its divisors is an integer number (20344749).

Almost surely, 2^40689497 is an apocalyptic number.

It is an amenable number.

40689497 is a deficient number, since it is larger than the sum of its proper divisors (1).

40689497 is an equidigital number, since it uses as much as digits as its factorization.

40689497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 40689497 is about 6378.8319463676. The cubic root of 40689497 is about 343.9490443048.

The spelling of 40689497 in words is "forty million, six hundred eighty-nine thousand, four hundred ninety-seven".