13887428 has 6 divisors (see below), whose sum is σ = 24303006. Its totient is φ = 6943712.

The previous prime is 13887427. The next prime is 13887449. The reversal of 13887428 is 82478831.

It can be written as a sum of positive squares in only one way, i.e., 7496644 + 6390784 = 2738^2 + 2528^2 .

It is not an unprimeable number, because it can be changed into a prime (13887421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1735925 + ... + 1735932.

It is an arithmetic number, because the mean of its divisors is an integer number (4050501).

Almost surely, 2^13887428 is an apocalyptic number.

It is an amenable number.

13887428 is a deficient number, since it is larger than the sum of its proper divisors (10415578).

13887428 is a wasteful number, since it uses less digits than its factorization.

13887428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471861 (or 3471859 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The square root of 13887428 is about 3726.5839585336. The cubic root of 13887428 is about 240.3665002236.

The spelling of 13887428 in words is "thirteen million, eight hundred eighty-seven thousand, four hundred twenty-eight".