40409273 has 2 divisors, whose sum is σ = 40409274. Its totient is φ = 40409272.

The previous prime is 40409263. The next prime is 40409279. The reversal of 40409273 is 37290404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37613689 + 2795584 = 6133^2 + 1672^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40409273 is a prime.

It is not a weakly prime, because it can be changed into another prime (40409279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20204636 + 20204637.

It is an arithmetic number, because the mean of its divisors is an integer number (20204637).

Almost surely, 2^40409273 is an apocalyptic number.

It is an amenable number.

40409273 is a deficient number, since it is larger than the sum of its proper divisors (1).

40409273 is an equidigital number, since it uses as much as digits as its factorization.

40409273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 40409273 is about 6356.8288477825. The cubic root of 40409273 is about 343.1576452650.

Adding to 40409273 its reverse (37290404), we get a palindrome (77699677).

The spelling of 40409273 in words is "forty million, four hundred nine thousand, two hundred seventy-three".