40478121889 has 4 divisors (see below), whose sum is σ = 42238040256. Its totient is φ = 38718203524.

The previous prime is 40478121883. The next prime is 40478122021. The reversal of 40478121889 is 98812187404.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40478121889 - 2²¹ = 40476024737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40478121883) 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, 879959149 + ... + 879959194.

It is an arithmetic number, because the mean of its divisors is an integer number (10559510064).

Almost surely, 2^40478121889 is an apocalyptic number.

It is an amenable number.

40478121889 is a deficient number, since it is larger than the sum of its proper divisors (1759918367).

40478121889 is a wasteful number, since it uses less digits than its factorization.

40478121889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1759918366.

The product of its (nonzero) digits is 1032192, while the sum is 52.

The spelling of 40478121889 in words is "forty billion, four hundred seventy-eight million, one hundred twenty-one thousand, eight hundred eighty-nine".