40242187 has 2 divisors, whose sum is σ = 40242188. Its totient is φ = 40242186.

The previous prime is 40242173. The next prime is 40242217. The reversal of 40242187 is 78124204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40242187 - 2¹⁵ = 40209419 is a prime.

It is a super-2 number, since 2×40242187² = 3238867229085938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40242287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20121093 + 20121094.

It is an arithmetic number, because the mean of its divisors is an integer number (20121094).

Almost surely, 2^40242187 is an apocalyptic number.

40242187 is a deficient number, since it is larger than the sum of its proper divisors (1).

40242187 is an equidigital number, since it uses as much as digits as its factorization.

40242187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 40242187 is about 6343.6729896803. The cubic root of 40242187 is about 342.6840242174.

The spelling of 40242187 in words is "forty million, two hundred forty-two thousand, one hundred eighty-seven".