11430840978 has 24 divisors (see below), whose sum is σ = 25843641408. Its totient is φ = 3644615832.

The previous prime is 11430840977. The next prime is 11430840979. The reversal of 11430840978 is 87904803411.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11430840977) and next prime (11430840979).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (11430840977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13804950 + ... + 13805777.

It is an arithmetic number, because the mean of its divisors is an integer number (1076818392).

Almost surely, 2^11430840978 is an apocalyptic number.

11430840978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11430840978 is an abundant number, since it is smaller than the sum of its proper divisors (14412800430).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11430840978 is a wasteful number, since it uses less digits than its factorization.

11430840978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27610758 (or 27610755 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 11430840978 in words is "eleven billion, four hundred thirty million, eight hundred forty thousand, nine hundred seventy-eight".