40404289 has 2 divisors, whose sum is σ = 40404290. Its totient is φ = 40404288.

The previous prime is 40404271. The next prime is 40404319. The reversal of 40404289 is 98240404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24920064 + 15484225 = 4992^2 + 3935^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40404289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40404289.

It is not a weakly prime, because it can be changed into another prime (40404209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20202144 + 20202145.

It is an arithmetic number, because the mean of its divisors is an integer number (20202145).

Almost surely, 2^40404289 is an apocalyptic number.

It is an amenable number.

40404289 is a deficient number, since it is larger than the sum of its proper divisors (1).

40404289 is an equidigital number, since it uses as much as digits as its factorization.

40404289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 40404289 is about 6356.4368163304. The cubic root of 40404289 is about 343.1435365560.

The spelling of 40404289 in words is "forty million, four hundred four thousand, two hundred eighty-nine".