12945745 has 32 divisors (see below), whose sum is σ = 17510400. Its totient is φ = 9144576.

The previous prime is 12945739. The next prime is 12945767. The reversal of 12945745 is 54754921.

It is a 2-Lehmer number, since φ(12945745) divides (12945745-1)².

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 12945745 - 2⁷ = 12945617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101872 + ... + 101998.

It is an arithmetic number, because the mean of its divisors is an integer number (547200).

It is a Poulet number, since it divides 2^12945744-1.

Almost surely, 2^12945745 is an apocalyptic number.

It is an amenable number.

12945745 is a deficient number, since it is larger than the sum of its proper divisors (4564655).

12945745 is a wasteful number, since it uses less digits than its factorization.

12945745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217.

The product of its digits is 50400, while the sum is 37.

The square root of 12945745 is about 3598.0195941657. The cubic root of 12945745 is about 234.8059058287.

The spelling of 12945745 in words is "twelve million, nine hundred forty-five thousand, seven hundred forty-five".