12457381 has 8 divisors (see below), whose sum is σ = 12918528. Its totient is φ = 12000000.

The previous prime is 12457373. The next prime is 12457391. The reversal of 12457381 is 18375421.

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

It is a 6-Lehmer number, since φ(12457381) divides (12457381-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 12457381 - 2³ = 12457373 is a prime.

It is a super-2 number, since 2×12457381² = 310372682758322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12457301) 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, 6981 + ... + 8581.

It is an arithmetic number, because the mean of its divisors is an integer number (1614816).

Almost surely, 2^12457381 is an apocalyptic number.

It is an amenable number.

12457381 is a deficient number, since it is larger than the sum of its proper divisors (461147).

12457381 is a wasteful number, since it uses less digits than its factorization.

12457381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1883.

The product of its digits is 6720, while the sum is 31.

The square root of 12457381 is about 3529.5015228783. The cubic root of 12457381 is about 231.8153815141.

The spelling of 12457381 in words is "twelve million, four hundred fifty-seven thousand, three hundred eighty-one".