12157758 has 36 divisors (see below), whose sum is σ = 27816048. Its totient is φ = 3837240.

The previous prime is 12157741. The next prime is 12157759. The reversal of 12157758 is 85775121.

It is a super-2 number, since 2×12157758² = 295622159173128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12157759) 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 17 ways as a sum of consecutive naturals, for example, 5563 + ... + 7433.

It is an arithmetic number, because the mean of its divisors is an integer number (772668).

Almost surely, 2^12157758 is an apocalyptic number.

12157758 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12157758, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13908024).

12157758 is an abundant number, since it is smaller than the sum of its proper divisors (15658290).

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

12157758 is a wasteful number, since it uses less digits than its factorization.

12157758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917 (or 1895 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 12157758 is about 3486.7976712164. The cubic root of 12157758 is about 229.9417495838.

The spelling of 12157758 in words is "twelve million, one hundred fifty-seven thousand, seven hundred fifty-eight".