40289369 has 2 divisors, whose sum is σ = 40289370. Its totient is φ = 40289368.

The previous prime is 40289309. The next prime is 40289383. The reversal of 40289369 is 96398204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21279769 + 19009600 = 4613^2 + 4360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40289369 is a prime.

It is a super-2 number, since 2×40289369² = 3246466508836322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (40289309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20144684 + 20144685.

It is an arithmetic number, because the mean of its divisors is an integer number (20144685).

Almost surely, 2^40289369 is an apocalyptic number.

It is an amenable number.

40289369 is a deficient number, since it is larger than the sum of its proper divisors (1).

40289369 is an equidigital number, since it uses as much as digits as its factorization.

40289369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 40289369 is about 6347.3907237541. The cubic root of 40289369 is about 342.8178986745.

The spelling of 40289369 in words is "forty million, two hundred eighty-nine thousand, three hundred sixty-nine".