1231928 has 8 divisors (see below), whose sum is σ = 2309880. Its totient is φ = 615960.

The previous prime is 1231889. The next prime is 1231943. The reversal of 1231928 is 8291321.

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 = 1231897 and 1231906.

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, 76988 + ... + 77003.

It is an arithmetic number, because the mean of its divisors is an integer number (288735).

2^1231928 is an apocalyptic number.

It is an amenable number.

1231928 is a deficient number, since it is larger than the sum of its proper divisors (1077952).

1231928 is a wasteful number, since it uses less digits than its factorization.

1231928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153997 (or 153993 counting only the distinct ones).

The product of its digits is 864, while the sum is 26.

The square root of 1231928 is about 1109.9225198184. The cubic root of 1231928 is about 107.2000798247.

The spelling of 1231928 in words is "one million, two hundred thirty-one thousand, nine hundred twenty-eight".