1213878375 has 72 divisors (see below), whose sum is σ = 2268042192. Its totient is φ = 624590400.

The previous prime is 1213878361. The next prime is 1213878401. The reversal of 1213878375 is 5738783121.

1213878375 is a `hidden beast` number, since 121 + 387 + 83 + 75 = 666.

It is not a de Polignac number, because 1213878375 - 2⁶ = 1213878311 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1213878375.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 945484 + ... + 946766.

It is an arithmetic number, because the mean of its divisors is an integer number (31500586).

Almost surely, 2^1213878375 is an apocalyptic number.

1213878375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1213878375 is a deficient number, since it is larger than the sum of its proper divisors (1054163817).

1213878375 is a wasteful number, since it uses less digits than its factorization.

1213878375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1362 (or 1320 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 1213878375 is about 34840.7573826976. The cubic root of 1213878375 is about 1066.7395363087.

The spelling of 1213878375 in words is "one billion, two hundred thirteen million, eight hundred seventy-eight thousand, three hundred seventy-five".