13400066 has 4 divisors (see below), whose sum is σ = 20100102. Its totient is φ = 6700032.

The previous prime is 13400041. The next prime is 13400077. The reversal of 13400066 is 66000431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66000431 = 7 ⋅9428633.

It can be written as a sum of positive squares in only one way, i.e., 12752041 + 648025 = 3571^2 + 805^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3350015 + ... + 3350018.

Almost surely, 2^13400066 is an apocalyptic number.

13400066 is a deficient number, since it is larger than the sum of its proper divisors (6700036).

13400066 is an equidigital number, since it uses as much as digits as its factorization.

13400066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6700035.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 13400066 is about 3660.6100584465. The cubic root of 13400066 is about 237.5211637650.

Adding to 13400066 its reverse (66000431), we get a palindrome (79400497).

The spelling of 13400066 in words is "thirteen million, four hundred thousand, sixty-six".