13720646 has 4 divisors (see below), whose sum is σ = 20580972. Its totient is φ = 6860322.

The previous prime is 13720639. The next prime is 13720657. The reversal of 13720646 is 64602731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64602731 = 101 ⋅639631.

It is a super-2 number, since 2×13720646² = 376512253314632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3430160 + ... + 3430163.

It is an arithmetic number, because the mean of its divisors is an integer number (5145243).

Almost surely, 2^13720646 is an apocalyptic number.

13720646 is a deficient number, since it is larger than the sum of its proper divisors (6860326).

13720646 is an equidigital number, since it uses as much as digits as its factorization.

13720646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6860325.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 13720646 is about 3704.1390362674. The cubic root of 13720646 is about 239.4003897699.

The spelling of 13720646 in words is "thirteen million, seven hundred twenty thousand, six hundred forty-six".