11978420 has 24 divisors (see below), whose sum is σ = 25691904. Its totient is φ = 4689056.

The previous prime is 11978419. The next prime is 11978429. The reversal of 11978420 is 2487911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11978429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5432 + ... + 7311.

It is an arithmetic number, because the mean of its divisors is an integer number (1070496).

Almost surely, 2^11978420 is an apocalyptic number.

11978420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11978420 is an abundant number, since it is smaller than the sum of its proper divisors (13713484).

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

11978420 is a wasteful number, since it uses less digits than its factorization.

11978420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12799 (or 12797 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 11978420 is about 3460.9854088106. The cubic root of 11978420 is about 228.8055276429.

The spelling of 11978420 in words is "eleven million, nine hundred seventy-eight thousand, four hundred twenty".