40218739 has 4 divisors (see below), whose sum is σ = 43875000. Its totient is φ = 36562480.

The previous prime is 40218733. The next prime is 40218751. The reversal of 40218739 is 93781204.

40218739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40218739 - 2²³ = 31830131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40218733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1828114 + ... + 1828135.

It is an arithmetic number, because the mean of its divisors is an integer number (10968750).

Almost surely, 2^40218739 is an apocalyptic number.

40218739 is a deficient number, since it is larger than the sum of its proper divisors (3656261).

40218739 is a wasteful number, since it uses less digits than its factorization.

40218739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656260.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 40218739 is about 6341.8245797247. The cubic root of 40218739 is about 342.6174538117.

The spelling of 40218739 in words is "forty million, two hundred eighteen thousand, seven hundred thirty-nine".