19215428 has 6 divisors (see below), whose sum is σ = 33627006. Its totient is φ = 9607712.

The previous prime is 19215421. The next prime is 19215431. The reversal of 19215428 is 82451291.

It can be written as a sum of positive squares in only one way, i.e., 16386304 + 2829124 = 4048^2 + 1682^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19215394 and 19215403.

It is not an unprimeable number, because it can be changed into a prime (19215421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2401925 + ... + 2401932.

It is an arithmetic number, because the mean of its divisors is an integer number (5604501).

Almost surely, 2^19215428 is an apocalyptic number.

It is an amenable number.

19215428 is a deficient number, since it is larger than the sum of its proper divisors (14411578).

19215428 is a wasteful number, since it uses less digits than its factorization.

19215428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4803861 (or 4803859 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 19215428 is about 4383.5405781172. The cubic root of 19215428 is about 267.8448831333.

The spelling of 19215428 in words is "nineteen million, two hundred fifteen thousand, four hundred twenty-eight".