40121855 has 4 divisors (see below), whose sum is σ = 48146232. Its totient is φ = 32097480.

The previous prime is 40121839. The next prime is 40121857. The reversal of 40121855 is 55812104.

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

It is not a de Polignac number, because 40121855 - 2⁴ = 40121839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40121857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4012181 + ... + 4012190.

It is an arithmetic number, because the mean of its divisors is an integer number (12036558).

Almost surely, 2^40121855 is an apocalyptic number.

40121855 is a deficient number, since it is larger than the sum of its proper divisors (8024377).

40121855 is an equidigital number, since it uses as much as digits as its factorization.

40121855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8024376.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 40121855 is about 6334.1814782969. The cubic root of 40121855 is about 342.3421191457.

Adding to 40121855 its reverse (55812104), we get a palindrome (95933959).

The spelling of 40121855 in words is "forty million, one hundred twenty-one thousand, eight hundred fifty-five".