13973945 has 4 divisors (see below), whose sum is σ = 16768740. Its totient is φ = 11179152.

The previous prime is 13973933. The next prime is 13973951. The reversal of 13973945 is 54937931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54937931 = 17 ⋅3231643.

It can be written as a sum of positive squares in 2 ways, for example, as 3031081 + 10942864 = 1741^2 + 3308^2 .

It is a cyclic number.

It is not a de Polignac number, because 13973945 - 2⁴ = 13973929 is a prime.

It is a super-2 number, since 2×13973945² = 390542277726050, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1397390 + ... + 1397399.

It is an arithmetic number, because the mean of its divisors is an integer number (4192185).

Almost surely, 2^13973945 is an apocalyptic number.

It is an amenable number.

13973945 is a deficient number, since it is larger than the sum of its proper divisors (2794795).

13973945 is an equidigital number, since it uses as much as digits as its factorization.

13973945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794794.

The product of its digits is 102060, while the sum is 41.

The square root of 13973945 is about 3738.1740194913. The cubic root of 13973945 is about 240.8646186720.

The spelling of 13973945 in words is "thirteen million, nine hundred seventy-three thousand, nine hundred forty-five".