40121398 has 8 divisors (see below), whose sum is σ = 60232392. Its totient is φ = 20043936.

The previous prime is 40121387. The next prime is 40121399. The reversal of 40121398 is 89312104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5140 + ... + 10327.

It is an arithmetic number, because the mean of its divisors is an integer number (7529049).

Almost surely, 2^40121398 is an apocalyptic number.

40121398 is a deficient number, since it is larger than the sum of its proper divisors (20110994).

40121398 is a wasteful number, since it uses less digits than its factorization.

40121398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16766.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 40121398 is about 6334.1454040778. The cubic root of 40121398 is about 342.3408193475.

The spelling of 40121398 in words is "forty million, one hundred twenty-one thousand, three hundred ninety-eight".