40121998 has 32 divisors (see below), whose sum is σ = 71516160. Its totient is φ = 16519680.

The previous prime is 40121981. The next prime is 40121999. The reversal of 40121998 is 89912104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83523 + ... + 84001.

It is an arithmetic number, because the mean of its divisors is an integer number (2234880).

Almost surely, 2^40121998 is an apocalyptic number.

40121998 is a deficient number, since it is larger than the sum of its proper divisors (31394162).

40121998 is a wasteful number, since it uses less digits than its factorization.

40121998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 40121998 is about 6334.1927662489. The cubic root of 40121998 is about 342.3425258639.

The spelling of 40121998 in words is "forty million, one hundred twenty-one thousand, nine hundred ninety-eight".