11914430978 has 18 divisors (see below), whose sum is σ = 18119279241. Its totient is φ = 5875787424.

The previous prime is 11914430971. The next prime is 11914430987. The reversal of 11914430978 is 87903441911.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8882497009 + 3031933969 = 94247^2 + 55063^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=77183.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11914430971) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12194426 + ... + 12195402.

Almost surely, 2^11914430978 is an apocalyptic number.

11914430978 is a deficient number, since it is larger than the sum of its proper divisors (6204848263).

11914430978 is an frugal number, since it uses more digits than its factorization.

11914430978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114 (or 1058 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 11914430978 in words is "eleven billion, nine hundred fourteen million, four hundred thirty thousand, nine hundred seventy-eight".