40684489 has 2 divisors, whose sum is σ = 40684490. Its totient is φ = 40684488.

The previous prime is 40684487. The next prime is 40684507. The reversal of 40684489 is 98448604.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40106889 + 577600 = 6333^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 40684489 - 2¹ = 40684487 is a prime.

It is a super-2 number, since 2×40684489² = 3310455290382242, which contains 22 as substring.

Together with 40684487, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40684487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20342244 + 20342245.

It is an arithmetic number, because the mean of its divisors is an integer number (20342245).

Almost surely, 2^40684489 is an apocalyptic number.

It is an amenable number.

40684489 is a deficient number, since it is larger than the sum of its proper divisors (1).

40684489 is an equidigital number, since it uses as much as digits as its factorization.

40684489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 43.

The square root of 40684489 is about 6378.4393859313. The cubic root of 40684489 is about 343.9349328214.

The spelling of 40684489 in words is "forty million, six hundred eighty-four thousand, four hundred eighty-nine".