13278429 has 18 divisors (see below), whose sum is σ = 20057310. Its totient is φ = 8464368.

The previous prime is 13278413. The next prime is 13278439. The reversal of 13278429 is 92487231.

It can be written as a sum of positive squares in only one way, i.e., 11902500 + 1375929 = 3450^2 + 1173^2 .

It is not a de Polignac number, because 13278429 - 2⁴ = 13278413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13278393 and 13278402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13278439) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3367 + ... + 6155.

It is an arithmetic number, because the mean of its divisors is an integer number (1114295).

Almost surely, 2^13278429 is an apocalyptic number.

It is an amenable number.

13278429 is a deficient number, since it is larger than the sum of its proper divisors (6778881).

13278429 is a wasteful number, since it uses less digits than its factorization.

13278429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841 (or 2815 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 13278429 is about 3643.9578757170. The cubic root of 13278429 is about 236.8002910899.

The spelling of 13278429 in words is "thirteen million, two hundred seventy-eight thousand, four hundred twenty-nine".