15855428 has 6 divisors (see below), whose sum is σ = 27747006. Its totient is φ = 7927712.

The previous prime is 15855401. The next prime is 15855449. The reversal of 15855428 is 82455851.

It can be written as a sum of positive squares in only one way, i.e., 15382084 + 473344 = 3922^2 + 688^2 .

It is a junction number, because it is equal to n+sod(n) for n = 15855391 and 15855400.

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, 1981925 + ... + 1981932.

It is an arithmetic number, because the mean of its divisors is an integer number (4624501).

Almost surely, 2^15855428 is an apocalyptic number.

It is an amenable number.

15855428 is a deficient number, since it is larger than the sum of its proper divisors (11891578).

15855428 is a wasteful number, since it uses less digits than its factorization.

15855428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3963861 (or 3963859 counting only the distinct ones).

The product of its digits is 64000, while the sum is 38.

The square root of 15855428 is about 3981.8874921323. The cubic root of 15855428 is about 251.2229570821. Note that the first 3 decimals are identical.

The spelling of 15855428 in words is "fifteen million, eight hundred fifty-five thousand, four hundred twenty-eight".