12157878 has 16 divisors (see below), whose sum is σ = 24373440. Its totient is φ = 4043016.

The previous prime is 12157877. The next prime is 12157879. The reversal of 12157878 is 87875121.

It is an interprime number because it is at equal distance from previous prime (12157877) and next prime (12157879).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12157877) 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, 633 + ... + 4971.

It is an arithmetic number, because the mean of its divisors is an integer number (1523340).

Almost surely, 2^12157878 is an apocalyptic number.

12157878 is an abundant number, since it is smaller than the sum of its proper divisors (12215562).

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

12157878 is a wasteful number, since it uses less digits than its factorization.

12157878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4811.

The product of its digits is 31360, while the sum is 39.

The square root of 12157878 is about 3486.8148789404. The cubic root of 12157878 is about 229.9425061081.

The spelling of 12157878 in words is "twelve million, one hundred fifty-seven thousand, eight hundred seventy-eight".