1215928 has 16 divisors (see below), whose sum is σ = 2605680. Its totient is φ = 521088.

The previous prime is 1215923. The next prime is 1216009. The reversal of 1215928 is 8295121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 1215896 and 1215905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10801 + ... + 10912.

It is an arithmetic number, because the mean of its divisors is an integer number (162855).

2^1215928 is an apocalyptic number.

It is an amenable number.

1215928 is an abundant number, since it is smaller than the sum of its proper divisors (1389752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1215928 is a wasteful number, since it uses less digits than its factorization.

1215928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21726 (or 21722 counting only the distinct ones).

The product of its digits is 1440, while the sum is 28.

The square root of 1215928 is about 1102.6912532527. The cubic root of 1215928 is about 106.7339592744.

The spelling of 1215928 in words is "one million, two hundred fifteen thousand, nine hundred twenty-eight".