1340212428 has 36 divisors (see below), whose sum is σ = 3470391288. Its totient is φ = 435840960.

The previous prime is 1340212421. The next prime is 1340212441. The reversal of 1340212428 is 8242120431.

1340212428 is a `hidden beast` number, since 13 + 402 + 1 + 242 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1340212421) 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, 452526 + ... + 455477.

It is an arithmetic number, because the mean of its divisors is an integer number (96399758).

Almost surely, 2^1340212428 is an apocalyptic number.

1340212428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1340212428 is an abundant number, since it is smaller than the sum of its proper divisors (2130178860).

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

1340212428 is a wasteful number, since it uses less digits than its factorization.

1340212428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908054 (or 908049 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 1340212428 is about 36608.9118658285. The cubic root of 1340212428 is about 1102.5320261572.

Adding to 1340212428 its reverse (8242120431), we get a palindrome (9582332859).

The spelling of 1340212428 in words is "one billion, three hundred forty million, two hundred twelve thousand, four hundred twenty-eight".