40388489 has 2 divisors, whose sum is σ = 40388490. Its totient is φ = 40388488.

The previous prime is 40388473. The next prime is 40388507. The reversal of 40388489 is 98488304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37002889 + 3385600 = 6083^2 + 1840^2 .

It is a cyclic number.

It is not a de Polignac number, because 40388489 - 2⁴ = 40388473 is a prime.

It is not a weakly prime, because it can be changed into another prime (40388419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20194244 + 20194245.

It is an arithmetic number, because the mean of its divisors is an integer number (20194245).

Almost surely, 2^40388489 is an apocalyptic number.

It is an amenable number.

40388489 is a deficient number, since it is larger than the sum of its proper divisors (1).

40388489 is an equidigital number, since it uses as much as digits as its factorization.

40388489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 40388489 is about 6355.1938601431. The cubic root of 40388489 is about 343.0988022396.

The spelling of 40388489 in words is "forty million, three hundred eighty-eight thousand, four hundred eighty-nine".