13957505 has 4 divisors (see below), whose sum is σ = 16749012.
Its totient is φ = 11166000.
The previous prime is 13957477. The next prime is 13957513. The reversal of 13957505 is 50575931.
13957505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50575931 = 7 ⋅7225133.
It can be written as a sum of positive squares in 2 ways, for example, as 10817521 + 3139984 = 3289^2 + 1772^2
It is not a de Polignac number, because 13957505 - 28 = 13957249 is a prime.
It is a Duffinian number.
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, 1395746 + ... + 1395755.
It is an arithmetic number, because the mean of its divisors is an integer number (4187253).
Almost surely, 213957505 is an apocalyptic number.
It is an amenable number.
13957505 is a deficient number, since it is larger than the sum of its proper divisors (2791507).
13957505 is an equidigital number, since it uses as much as digits as its factorization.
13957505 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2791506.
The product of its (nonzero) digits is 23625, while the sum is 35.
The square root of 13957505 is about 3735.9744378140.
The cubic root of 13957505 is about 240.7701245206.
The spelling of 13957505 in words is "thirteen million, nine hundred fifty-seven thousand, five hundred five".