12457780 has 12 divisors (see below), whose sum is σ = 26161380. Its totient is φ = 4983104.

The previous prime is 12457777. The next prime is 12457799. The reversal of 12457780 is 8775421.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3825936 + 8631844 = 1956^2 + 2938^2 .

It is a super-4 number, since 4×12457780⁴ (a number of 29 digits) contains 4444 as substring.

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 3 ways as a sum of consecutive naturals, for example, 311425 + ... + 311464.

It is an arithmetic number, because the mean of its divisors is an integer number (2180115).

Almost surely, 2^12457780 is an apocalyptic number.

12457780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12457780 is an abundant number, since it is smaller than the sum of its proper divisors (13703600).

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

12457780 is a wasteful number, since it uses less digits than its factorization.

12457780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622898 (or 622896 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 12457780 is about 3529.5580459882. The cubic root of 12457780 is about 231.8178564417.

It can be divided in two parts, 1245 and 7780, that added together give a square (9025 = 95²).

The spelling of 12457780 in words is "twelve million, four hundred fifty-seven thousand, seven hundred eighty".