12157765 has 8 divisors (see below), whose sum is σ = 14686848. Its totient is φ = 9661200.

The previous prime is 12157763. The next prime is 12157781. The reversal of 12157765 is 56775121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12157765 - 2¹ = 12157763 is a prime.

It is a super-2 number, since 2×12157765² = 295622499590450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12157765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12157763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7297 + ... + 8806.

It is an arithmetic number, because the mean of its divisors is an integer number (1835856).

Almost surely, 2^12157765 is an apocalyptic number.

It is an amenable number.

12157765 is a deficient number, since it is larger than the sum of its proper divisors (2529083).

12157765 is a wasteful number, since it uses less digits than its factorization.

12157765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16259.

The product of its digits is 14700, while the sum is 34.

The square root of 12157765 is about 3486.7986750026. The cubic root of 12157765 is about 229.9417937145.

The spelling of 12157765 in words is "twelve million, one hundred fifty-seven thousand, seven hundred sixty-five".