40634389 has 2 divisors, whose sum is σ = 40634390. Its totient is φ = 40634388.

The previous prime is 40634387. The next prime is 40634417. The reversal of 40634389 is 98343604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31979025 + 8655364 = 5655^2 + 2942^2 .

It is a cyclic number.

It is not a de Polignac number, because 40634389 - 2¹ = 40634387 is a prime.

Together with 40634387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40634381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20317194 + 20317195.

It is an arithmetic number, because the mean of its divisors is an integer number (20317195).

Almost surely, 2^40634389 is an apocalyptic number.

It is an amenable number.

40634389 is a deficient number, since it is larger than the sum of its proper divisors (1).

40634389 is an equidigital number, since it uses as much as digits as its factorization.

40634389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 40634389 is about 6374.5108831972. The cubic root of 40634389 is about 343.7936978498.

The spelling of 40634389 in words is "forty million, six hundred thirty-four thousand, three hundred eighty-nine".