1356172812 has 18 divisors (see below), whose sum is σ = 3428103588. Its totient is φ = 452057592.

The previous prime is 1356172799. The next prime is 1356172817. The reversal of 1356172812 is 2182716531.

1356172812 is a `hidden beast` number, since 1 + 3 + 5 + 617 + 28 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 37671467 = 1356172812 / (1 + 3 + 5 + 6 + 1 + 7 + 2 + 8 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (1356172817) 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 5 ways as a sum of consecutive naturals, for example, 18835698 + ... + 18835769.

Almost surely, 2^1356172812 is an apocalyptic number.

1356172812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1356172812 is an abundant number, since it is smaller than the sum of its proper divisors (2071930776).

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

1356172812 is a wasteful number, since it uses less digits than its factorization.

1356172812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37671477 (or 37671472 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 1356172812 is about 36826.2516691558. The cubic root of 1356172812 is about 1106.8913948628.

The spelling of 1356172812 in words is "one billion, three hundred fifty-six million, one hundred seventy-two thousand, eight hundred twelve".