40018398 has 48 divisors (see below), whose sum is σ = 94337280. Its totient is φ = 11282544.

The previous prime is 40018393. The next prime is 40018403. The reversal of 40018398 is 89381004.

40018398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40018393) and next prime (40018403).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40018393) 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 23 ways as a sum of consecutive naturals, for example, 22365 + ... + 24087.

It is an arithmetic number, because the mean of its divisors is an integer number (1965360).

Almost surely, 2^40018398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40018398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47168640).

40018398 is an abundant number, since it is smaller than the sum of its proper divisors (54318882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40018398 is a wasteful number, since it uses less digits than its factorization.

40018398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821 (or 1814 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 40018398 is about 6326.0096427369. The cubic root of 40018398 is about 342.0476148609.

The spelling of 40018398 in words is "forty million, eighteen thousand, three hundred ninety-eight".