13621928 has 8 divisors (see below), whose sum is σ = 25541130. Its totient is φ = 6810960.

The previous prime is 13621921. The next prime is 13621943. The reversal of 13621928 is 82912631.

It can be written as a sum of positive squares in only one way, i.e., 13235044 + 386884 = 3638^2 + 622^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 13621894 and 13621903.

It is not an unprimeable number, because it can be changed into a prime (13621921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 851363 + ... + 851378.

Almost surely, 2^13621928 is an apocalyptic number.

It is an amenable number.

13621928 is a deficient number, since it is larger than the sum of its proper divisors (11919202).

13621928 is a wasteful number, since it uses less digits than its factorization.

13621928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702747 (or 1702743 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 13621928 is about 3690.7896174125. The cubic root of 13621928 is about 238.8248572411.

The spelling of 13621928 in words is "thirteen million, six hundred twenty-one thousand, nine hundred twenty-eight".