40387229 has 2 divisors, whose sum is σ = 40387230. Its totient is φ = 40387228.

The previous prime is 40387183. The next prime is 40387231. The reversal of 40387229 is 92278304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35880100 + 4507129 = 5990^2 + 2123^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40387229 is a prime.

It is a super-2 number, since 2×40387229² = 3262256532596882, which contains 22 as substring.

Together with 40387231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40387279) 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, 20193614 + 20193615.

It is an arithmetic number, because the mean of its divisors is an integer number (20193615).

Almost surely, 2^40387229 is an apocalyptic number.

It is an amenable number.

40387229 is a deficient number, since it is larger than the sum of its proper divisors (1).

40387229 is an equidigital number, since it uses as much as digits as its factorization.

40387229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 40387229 is about 6355.0947278542. The cubic root of 40387229 is about 343.0952343172.

The spelling of 40387229 in words is "forty million, three hundred eighty-seven thousand, two hundred twenty-nine".