13981945 has 8 divisors (see below), whose sum is σ = 16798536. Its totient is φ = 11172096.

The previous prime is 13981937. The next prime is 13981951. The reversal of 13981945 is 54918931.

It can be written as a sum of positive squares in 4 ways, for example, as 674041 + 13307904 = 821^2 + 3648^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 13981945 - 2³ = 13981937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13981898 and 13981907.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6529 + ... + 8401.

It is an arithmetic number, because the mean of its divisors is an integer number (2099817).

Almost surely, 2^13981945 is an apocalyptic number.

It is an amenable number.

13981945 is a deficient number, since it is larger than the sum of its proper divisors (2816591).

13981945 is a wasteful number, since it uses less digits than its factorization.

13981945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371.

The product of its digits is 38880, while the sum is 40.

The square root of 13981945 is about 3739.2439075300. The cubic root of 13981945 is about 240.9105744215.

The spelling of 13981945 in words is "thirteen million, nine hundred eighty-one thousand, nine hundred forty-five".