40218129 has 24 divisors (see below), whose sum is σ = 68536832. Its totient is φ = 22239360.

The previous prime is 40218127. The next prime is 40218137. The reversal of 40218129 is 92181204.

It is not a de Polignac number, because 40218129 - 2¹ = 40218127 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40218127) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8344 + ... + 12249.

Almost surely, 2^40218129 is an apocalyptic number.

It is an amenable number.

40218129 is a deficient number, since it is larger than the sum of its proper divisors (28318703).

40218129 is a wasteful number, since it uses less digits than its factorization.

40218129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20637 (or 20634 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 40218129 is about 6341.7764861275. The cubic root of 40218129 is about 342.6157216366.

The spelling of 40218129 in words is "forty million, two hundred eighteen thousand, one hundred twenty-nine".