13401566 has 4 divisors (see below), whose sum is σ = 20102352. Its totient is φ = 6700782.

The previous prime is 13401539. The next prime is 13401581. The reversal of 13401566 is 66510431.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3350390 + ... + 3350393.

It is an arithmetic number, because the mean of its divisors is an integer number (5025588).

Almost surely, 2^13401566 is an apocalyptic number.

13401566 is a deficient number, since it is larger than the sum of its proper divisors (6700786).

13401566 is an equidigital number, since it uses as much as digits as its factorization.

13401566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6700785.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 13401566 is about 3660.8149365954. The cubic root of 13401566 is about 237.5300261207.

Adding to 13401566 its reverse (66510431), we get a palindrome (79911997).

The spelling of 13401566 in words is "thirteen million, four hundred one thousand, five hundred sixty-six".