12040409978 has 32 divisors (see below), whose sum is σ = 18947174400. Its totient is φ = 5727599856.

The previous prime is 12040409977. The next prime is 12040410103. The reversal of 12040409978 is 87990404021.

It is not an unprimeable number, because it can be changed into a prime (12040409971) 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, 8460575 + ... + 8461997.

It is an arithmetic number, because the mean of its divisors is an integer number (592099200).

Almost surely, 2^12040409978 is an apocalyptic number.

12040409978 is a deficient number, since it is larger than the sum of its proper divisors (6906764422).

12040409978 is a wasteful number, since it uses less digits than its factorization.

12040409978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 12040409978 in words is "twelve billion, forty million, four hundred nine thousand, nine hundred seventy-eight".