40219987 has 2 divisors, whose sum is σ = 40219988. Its totient is φ = 40219986.

The previous prime is 40219981. The next prime is 40219997. The reversal of 40219987 is 78991204.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40219987 is a prime.

It is not a weakly prime, because it can be changed into another prime (40219981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20109993 + 20109994.

It is an arithmetic number, because the mean of its divisors is an integer number (20109994).

Almost surely, 2^40219987 is an apocalyptic number.

40219987 is a deficient number, since it is larger than the sum of its proper divisors (1).

40219987 is an equidigital number, since it uses as much as digits as its factorization.

40219987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 40219987 is about 6341.9229733575. The cubic root of 40219987 is about 342.6209976172.

The spelling of 40219987 in words is "forty million, two hundred nineteen thousand, nine hundred eighty-seven".