13977746 has 4 divisors (see below), whose sum is σ = 20966622. Its totient is φ = 6988872.

The previous prime is 13977737. The next prime is 13977751. The reversal of 13977746 is 64777931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64777931 = 83 ⋅780457.

It can be written as a sum of positive squares in only one way, i.e., 10310521 + 3667225 = 3211^2 + 1915^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13977697 and 13977706.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3494435 + ... + 3494438.

Almost surely, 2^13977746 is an apocalyptic number.

13977746 is a deficient number, since it is larger than the sum of its proper divisors (6988876).

13977746 is an equidigital number, since it uses as much as digits as its factorization.

13977746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6988875.

The product of its digits is 222264, while the sum is 44.

The square root of 13977746 is about 3738.6823882218. The cubic root of 13977746 is about 240.8864555839.

The spelling of 13977746 in words is "thirteen million, nine hundred seventy-seven thousand, seven hundred forty-six".