40400287 has 2 divisors, whose sum is σ = 40400288. Its totient is φ = 40400286.

The previous prime is 40400281. The next prime is 40400291. The reversal of 40400287 is 78200404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40400287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40400281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20200143 + 20200144.

It is an arithmetic number, because the mean of its divisors is an integer number (20200144).

Almost surely, 2^40400287 is an apocalyptic number.

40400287 is a deficient number, since it is larger than the sum of its proper divisors (1).

40400287 is an equidigital number, since it uses as much as digits as its factorization.

40400287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 40400287 is about 6356.1220095275. The cubic root of 40400287 is about 343.1322068530.

The spelling of 40400287 in words is "forty million, four hundred thousand, two hundred eighty-seven".