13989406 has 4 divisors (see below), whose sum is σ = 20984112. Its totient is φ = 6994702.

The previous prime is 13989389. The next prime is 13989407. The reversal of 13989406 is 60498931.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a pancake number, because a pancake can be divided into 13989406 parts by 5289 straight cuts.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13989407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3497350 + ... + 3497353.

It is an arithmetic number, because the mean of its divisors is an integer number (5246028).

Almost surely, 2^13989406 is an apocalyptic number.

13989406 is a deficient number, since it is larger than the sum of its proper divisors (6994706).

13989406 is an equidigital number, since it uses as much as digits as its factorization.

13989406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6994705.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 13989406 is about 3740.2414360573. The cubic root of 13989406 is about 240.9534181074.

The spelling of 13989406 in words is "thirteen million, nine hundred eighty-nine thousand, four hundred six".