11781420 has 48 divisors (see below), whose sum is σ = 37701888. Its totient is φ = 2692800.

The previous prime is 11781389. The next prime is 11781421. The reversal of 11781420 is 2418711.

11781420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (11781421) 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, 13606 + ... + 14445.

It is an arithmetic number, because the mean of its divisors is an integer number (785456).

Almost surely, 2^11781420 is an apocalyptic number.

11781420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11781420 is an abundant number, since it is smaller than the sum of its proper divisors (25920468).

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

11781420 is a wasteful number, since it uses less digits than its factorization.

11781420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28070 (or 28068 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 11781420 is about 3432.4073184865. The cubic root of 11781420 is about 227.5442573801.

The spelling of 11781420 in words is "eleven million, seven hundred eighty-one thousand, four hundred twenty".